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Well, thank you very much for that, and welcome to today's lecture.
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We're gonna be talking today about biodiversity.
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Here in the UK. And yes, as you mentioned, I am not originally from the UK.
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As you could probably tell, been here for a couple of years.
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Now, but with that I've talked quite a few ecology courses and just looking at lots of different environments around the world.
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So like talking about that today, but particularly with a lens looking at here in here in Britain.
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Speaking of today from London. I do apologize if you hear shouts in the background.
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Our students just got off of detention. So they're incredibly happy, as you can imagine.
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Should, it should be quite quiet otherwise. No.
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And today's session, the way I've structured it is I'm going to talk about the concept of biodiversity sort of what it is, how we, as ecologists and as scientists, we measure it.
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And actually actually go about measuring it as a value, and then also following that up with why, it's important.
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And all of my examples today are going to be from my adopted home here in Britain, in the British Isles, from London, where I live all the way out to the northern reaches of Scotland and Ireland, and I will be leaving time for questions and discussion at the end Fiona did
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mention she will be monitoring the chat throughout the talk.
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So please throw in questions as we go, or save them later, for the end.
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I also have a list which I believe Fiona will be sending out of articles and further readings for anyone who's interested.
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And you're also welcome to contact me if you want to have my details for any follow-up questions you have at the end of the talk so say, we're just gonna go over.
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Why, it's important, and what it is. In the first place, when saving some time for questions at the end, so to start, we're gonna get into what exactly biodiversity is and what it looks like here in the British isles.
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So if we're going on a really strict scientific, ecological definition of biodiversity, all it is, all it represents is the sum total of all of the organisms where they're plants, animals, fungi bugs, birds, bees, tiny microbes in an area.
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That's it generally, in addition to the number of species in an area, we'll also look at how genetically diverse those are.
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Which we'll get into in a little bit, but also the variety of environments and ecosystems that are in that area.
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Now, this may be a little bit technical, so I will break it down a bit.
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It's kind of a funny definition, because in some ways it's very technical and in other ways it's very simple.
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So first, as he called, just when we're looking at area.
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And we're looking at biodiversity. Really, it can be anywhere.
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So you could simply be looking at just the biodiversity of a town or city.
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You could be looking at a larger sort of county or island view like the Isle of Great Britain, which we'll be doing today, or, you know, even regions such as the British Isles in general, or even depending on the question that you're asking it could even be as broad as an entire
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continent could be looking at Europe, North America, South America, or even the entire globe, depending on the types of questions you're asking about biodiversity.
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Now for the second part of that definition. When we get into species, this is one of those things where a simplest area sounds.
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Species is not terribly simple. If you ever want to rile up and excite and enrage a biologist ask them what a species is.
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It's actually kind of a bit bit fun, especially if multiple different kinds of biologists in a room you're in for a several hour long Debate.
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But generally, if you are asking an ecologist like myself, or someone who deals with living animals like full size organisms, planets, etc., they're going to say that a species is a group of organisms that can meet with one another and produce what are called viable fertile
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offspring that can reproduce themselves, so they have to be able to produce babies.
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They have to be able to produce offspring and their offspring have to be able to produce young offspring themselves.
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So usually, we're looking at species. It's that fertility bit that defines a species so sterile.
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Offspring don't count. So this is one of the reasons why mules so those those horse donkey hybrids sometimes see in like farms and whatnot.
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They're not considered their own species because they're sterile.
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They can't they can't have their own babies.
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However different biologists do use different definitions of species so if you're talking to a paleontologist, for instance, if you find yourself at the natural History Museum, or like up at the National Museum up in Edinburgh.
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They look at bone structure, so what's called a morphological species concept don't worry about too much, but basically it's hard for them to be able to determine on extinct species.
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Who can mate with, who, if you talk to a geneticist, they have a completely definition, completely different definition so if you're talking with the call, just an environmental perspective, a group of individuals I can meet with one another and produce offspring.
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That's a species.
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And speaking of genetics and geneticists, not only ecologists are geneticists, but quite a few of them actually are and use genetic tools to try to answer questions about the environment and we're mainly to be able to look at the genetic diversity upstream so generally the
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more genetically diverse species is, the more stable it will be.
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We'll go into this in a bit more detail later, but generally the larger population, the more genetically diverse it is, the more stable the healthier it will be more able it will be to resist change.
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Again. We'll go into. Why, that's important. Later.
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And then finally, in addition to jeans ecologists are also interested in really large scales, such as entire ecosystems.
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The physical environments that the species live in themselves so ecosystems.
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These are going to represent all of the biological, but also all those physical earth elements in a defined area and they're also connected to other ecosystems.
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So the nutrients, for instance, in the hills up here in this photo of Cumbria, are eventually going to flow down to the fields.
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So ecosystems do not exist in isolation.
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They're all connected to one another. There's animals and plants and nutrients and water flowing in between them all.
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So, for instance, in this photo here from the aisle sky, there are several different ecosystems within this landscape, so in the distance we have several lake ecosystems.
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Those are going to be separate, but still having inputs and outputs to the fields that you see closer to the foreground, but also the hills and the mountains that you have there as well.
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And again, even though these would be considered sort of separate ecosystems.
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The way we sort of classify them out. They are connected to one another so the nutrients and the soil they're going to weather out of the mountains and the hills flow down into the valleys and fields, and then these nutrients will eventually end up in lakes and
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streams, and eventually flowing out to the ocean, and then, meanwhile, animals, especially are going to be moving in between them, in and out.
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I've even heard even things that you think would move between ecosystems such as fish and things like plank zooplankton things like that.
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They actually do. So lots of lots of movement all about in this.
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So knowing that, how do we actually get down and measure biodiversity?
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It's the sort of 2 ways to do it. One is to simply sit down and just count the species.
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This can be like the variations of genes as well.
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So, looking at the different, you know the amount of variability in those species, or also just the sheer number of ecosystems in a landscape.
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The other way is to number 2, not number one, but they're both important.
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Is that also compare how common, or also how rare species or genes or ecosystems are in a landscape.
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So we'll go kind of break these down into more detail.
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So, while simply counting the number of species in the landscape, sounds pretty easy, like asking a biologist what a species is.
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It's actually really difficult. And even though this is something we've been working at since the mid eighteenth century in a really strict, formal academic capacity and working on it for many millennia before that we still don't we still haven't identified every species.
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on the planet. We've only currently counted a.
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It's believed that we've counted 1.3 million different species so far, which sounds like a lot.
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But scientists have sat down and tried to estimate how many species are actually should be given.
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The amount that we already know and that values closer to 1.8 sorry 8.7 million.
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So so far we've only we've described less than 20% of the species on the planet.
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Now, there's a couple reasons for that. But even given the crazy genetic tools we can use, and all sorts of, you know, computer insistence that we have now and promote sensing using satellites to take photos of the Earth, there's still a lot of ecosystems that we
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just haven't been able to look at yet. Things like the deep oceans, things like thermal events, especially down in the deep oceans that are just incredibly hard to reach.
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It actually is true. We know more about the service of the moon than we do about the deep ocean here on earth.
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There's some other reasons as well. A lot of species are considered inconspicuous. Things like soil.
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Microbes, and you know certain different types of insects there's just not that big.
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So we're really good at counting, you know.
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Birds, mammals, nice, large, what we call megafauna.
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Some of the little critters get left behind and forgotten about.
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So, for instance, this little photo here on the top right.
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This is a photo of a pseudo scorpion what's called a soil. Arthropod.
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These guys live in soil. I've got one estimate that there may be up to 20 million species of little arthropods living in soil alone.
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Again. We haven't counted them all, but they guess that there should be a about 20 million of them.
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So, there are lots of scientists with lots of work ahead of them.
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Another issue is that sometimes, again, because species concepts are kind of fuzzy, and scientists fight about them a lot.
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It's actually hard to identify all of these different species.
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It's really difficult with the smaller in animal or plant or organism is, but it still occurs with large ones and this is when we have to start using genetic methods and really start to get into the nitty gritty the photo here that I have at the bottom are of different
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species of gulper shark, which are genetically different, do not interbreed, but if you pulled one out of the water you'd be a bit hard-pressed to sort of compare them and we have a lot of issues sometimes trying to look at you know, is just because something's
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a different colour. Does that mean? It's a different species.
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And sometimes species look really similar, but they don't, interbreed.
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So it is just very muddy and very messy.
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Another way, in addition to just simply counting the species, we can also compare how rare or how common species are.
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So just today's example here, this is sort of in your heads.
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Take a look at these 2 forest diagrams that I have here so both of these diagrams have 4 species of tree, and of course which I'll pose to you, and I post to my students.
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Is, it should be okay. When you look at it and makes sense.
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But the reason why is a bit interesting is which one do you think is more diverse? So if I were to ask you which of these 2 forests would you say, is a more diverse forest which one would you pick?
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And the answer is, and the most likely the one that you selected is the first one, and the reason why is because the species what's called the distribution.
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So the sort of the number of individuals in each species is more even so this community this ecosystem, isn't.
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Is it really dominated by one super common species?
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And then a bunch of really rare ones. There's you know, there's a couple individuals.
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There's probably a 4 or 5 of each tree species there.
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Because of this. This means that it's more even, which means it's more diverse overall.
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So, even though you could have an ecosystem, you could have an environment that has 4 species.
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If most of the trees in that forest are only comprised of one species, they're all the same.
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It's actually, not really that diverse.
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Now there's some portions of the world, and some portions of the UK that have a specially high biodiversity, and these are called biodiversity Hotspots and generally they're also if a region or an area has been identified as a
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biodiversity hotspot it usually is also being threatened by human activity.
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So official biodiversity hotspots here in the UK.
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This they're actually protected by the government. A great example of that, and I'll show you a few more in a couple of slides are the kelp forests off the coast of the UK.
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Most of the biodiversity hotspots here in Britain are actually marine.
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We're actually in our oceans, though there are some on land as well as you'll see.
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So now that that was basically it I've given you sort of a 10 min crash course in ecology and that you're now all budding ecologists.
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Let's take a look at what biodiversity actually looks like here in the British Isles.
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So generally when people think of Britain, I would be probably hard pressed if you asked people about the Uk.
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Abroad, it's not generally thought of as being in having a really high biodiversity.
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Now, there's a couple reasons for that, and it doesn't all have to do with humans.
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Part of it is that there is lots of development in that.
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It is just an area that has been sort of developed and urbanised for an incredibly long period of time.
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But that's that's not the only reason.
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Yes, it does have a high population. Density. Yes, there's been really, reasonably large cities here for quite a long time.
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It also has to do with the fact that we're just simply closer to the poll, to the North Pole.
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In this case down to the equator. So overall. If you look at all of the ecosystems across the whole planet, biodiversity is always going to be greater at the equator then is farther away at the than from the equator, so the equator, the equatorial regions those warmer regions are
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always going to have higher biodiversity than the more polar ones, the ones more north and South.
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From there. The other reason is, it's an island so islands, especially smaller islands.
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We're kind of reasonably sized island, but generally you're going to have lower biodiversity that say a continent.
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And this is just a square meter in issue. The larger area of land, the more species it can hold, the greater biodiversity can hold, and you can compare that to smaller regions. Smaller islands have fewer species. They're less diverse.
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Now that said, there are lots of areas of high biodiversity here in Britain.
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Again. People don't you don't really hear about people going on holiday for the wildlife here, and that isn't just to say that this isn't something we should work on.
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But there are some incredibly internationally important areas here.
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I could go on and spend entire lecture just in talk, just going over to all these different areas but I've selected just a couple here to go over as examples.
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First one up. St Kilda. Up in Scotland, in the Outer Hebrides is considered a biodiversity hotspot, mainly because it has absolutely massive seabird colonies that are vitally important globally the colonies of Gannets
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Atlantic Puffins, Leaches Petrels, Fulmars
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it'll also has species of wren, and actually species of mice of all things that are genetically unique to the island so if you're going up to St.
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Kilda, and you're looking at. You have a a mouse in your house that's actually a different species of mouse than you would find here in London and elsewhere.
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And so St Kilda is an interesting one where the sheer number of species that are found there is not crazy high, the ones that are found there, though, are just so vitally important to us that it is considered a biodiversity hotspot it's they're incredibly unique.
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And it's just these are sort of globally important breeding grounds for a lot of these bird species. And a lot of these massive, these seabird colonies.
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Another example, looking more mainland is the Braunton Burrows down in North Devon, it's a sand dune system.
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It's actually a UNESCO. So it's been recognized by the United Nations as a vitally important habitat.
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It's considered a biosphere reserve. And this is mainly because it has really for Britain has a very, very high plant biodiversity.
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So the types of plants and wildflowers that you find in brown burrows are much higher than phone elsewhere.
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Here, and there's also very rare plants there as well, which also tracked lots of butterflies, which generally are having a tough time in Britain at the moment the Water Germander, which is the lovely little flower shown here, is only found at a couple sites naturally in the UK one of which
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is brought, and boroughs it's found in gardens, and it's been cultivated.
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But if you're looking for in its natural habitat from Braunton Burrows is one of the places to go it's also protected, because it's a very delicate site.
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So it has a lot of erosion which, funny enough, was due to military training during the Second World War.
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After which we planted a lot of non-native species to help stabilise the soils, but also introduce lots of species that were not native to Britain.
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Which has made it really tough for these really delicate native species, such as the water grammar, to maintain.
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2 more examples here, one up the coast up in Norfolk, actually from Blakeney to Brancaster coast is incredibly important.
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One for turn, nesting but one species that's probably a little bit more charismatic, and people find a little bit more fun.
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Are the showstoppers, the large Grey Seal colonies that are found there and this region of Britain, it's considered it has really actually high, quite high biodiversity for Britain, and also in at the same time also has really rare species.
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So kind of similar to brown burrows in that regard versus you can compare that to St.
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Kilda, which has a ton of species, but the ones that are there are super important.
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And finally a bit of a fun one off the coast of Northern Ireland is Rathlin Island, which is really exciting, not just because of the rare plants that are found there in the bird biodiversity, but more so even for the animals that are found underwater.
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We have lots of Nudibranchs and Sea Anemonies which honestly are the things that most folks would associate with the tropics.
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But are growing at high abundance, and are doing quite well off the coast of Ireland.
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So if anyone is into scuba, I'm more of a snorkel person myself, though, but if you go off the coast of Rathlin Island, you can find some really exciting animals there again.
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Things that you usually would see more commonly associated with the tropics up here in the North.
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So why does Britain have these biodiversity hotspots?
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Why has? Why have scientists like me lobbied government to protect these areas?
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And the sad reason is. And the reason you probably already know is because biodiversity is decreasing, not just here in Britain, but all across the world.
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Scientists. We've estimated that by default diversity has decreased rapidly since the start of the Industrial Revolution.
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And that's been the real demarcation here.
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The graphs that I have here. I hope they're visible enough for you guys.
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Show 2 estimates of extinction rates, since about 1,500.
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So we have on the left. What is a highly conservative estimate which is considered sort of the best case scenario that we that we can have, and on the right the conservative estimate, which is the one that's more likely to occur and the dotted black line that you see sort of
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down there at the bottom. That says background. These are background extinction rates, 's the normal amount of extinction that should be occurring just due to natural evolution.
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So species go extinct, naturally, there's always like sort of this background rate of meaning species coming about, other ones going extinct.
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It's when the extinction rates are above that that we should start to get a bit worried.
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Also note when you're looking at these 2 graphs, the scale bars on the Y axis are a bit different.
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So the highly conservative estimates. It's found that about one to 1.5% of species have gone extinct in the last few couple 100 years versus the conservative estimate which depicts a range closer to 1.5 to 2% of species are have been going extinct as
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of late.
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So because of this, starting in the twentieth century, do, we've had internationally, but also sort of more within Europe, you know, on a continent scale.
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Here in Europe, and also nationally, we've had come up with what are called Red List species.
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And these are lists of species that are either at risk of extinction for various reasons and sort of ranking them as how likely they're going to go extinct.
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And these are terms you've likely heard before. If you've read news articles.
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About things like giant pandas, or you know, and other species orangutans that are at risk.
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And these lists internationally are managed by a group that's called the IUCN.
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This is the International Union for the Conservation of Nature and Natural Resources, and these lists are also set regionally and sort of nationally as well, and you are gonna have some species that may be at risk at a national level.
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That are fine internationally, an example of this in Britain is it's a bird called the Corn Crake.
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You've heard them before. They're a priority sort.
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Of. They're a, you know, at risk species here in Britain, because they're populations are really small, and its habitat range is really is very limited.
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I think, off the top of my head. I believe it's not Northern Ireland, but globally.
00:23:04.000 --> 00:23:06.000
They're actually doing. Okay. They have massive populations in Russia.
00:23:06.000 --> 00:23:15.000
So the species as a whole is doing. Ok, it's just that the species here in Britain is a bit at risk.
00:23:15.000 --> 00:23:21.000
So these, the categories are the least at threat.
00:23:21.000 --> 00:23:26.000
So you have first species of least concern. They're doing totally fine.
00:23:26.000 --> 00:23:29.000
We have species that are near threatened. They just simply mean that they they're sensitive to human activities.
00:23:29.000 --> 00:23:38.000
Their populations are starting to go down, but otherwise they're doing okay.
00:23:38.000 --> 00:23:45.000
We have vulnerable species. So these are species that are likely to become endangered if human activity continues as normal, and endangered species.
00:23:45.000 --> 00:23:54.000
And this is a term you probably definitely have heard before. So these are species that are at risk of extirpation or extinction.
00:23:54.000 --> 00:24:04.000
And extirpation simply means a localised extinction. So if a species goes extinct here in Britain, but not elsewhere, it's considered extirpated.
00:24:04.000 --> 00:24:08.000
It's been sort of driven off the island and have examples of these in a moment.
00:24:08.000 --> 00:24:13.000
So extirpation, more local extinction is global.
00:24:13.000 --> 00:24:16.000
So we've gotten critically endangered species.
00:24:16.000 --> 00:24:21.000
These are the ones that are at immediate risk for extirpation or extinction.
00:24:21.000 --> 00:24:35.000
These may even be ones that are sometimes considered functionally extinct in that they may only exist in zoos, or maybe there aren't enough males and females, or one sex or the other, to really have a nice viable healthy population, and produce lots of offspring.
00:24:35.000 --> 00:24:40.000
If you think back I think it's the black, the black rhino, or the white rhinos population in Africa.
00:24:40.000 --> 00:24:58.000
Kind of got to the point where there were several females, but only one male left so kind of functionally extinct, and then, finally, the simplest one, and the saddest one, which is just extinction, which means that the species no longer exists anywhere in the world.
00:24:58.000 --> 00:25:06.000
So are some examples of this here in Britain. Examples of different species from all these different levels, something that's going to be least concern are going to be.
00:25:06.000 --> 00:25:11.000
Things are just incredibly common. They give, you know, the European Robin any you know.
00:25:11.000 --> 00:25:23.000
Species such as that there! There's loads of them in our gardens, but if we start to look at some of the near-threatened species, a good example of this are Leisler's Bat.
00:25:23.000 --> 00:25:38.000
These are a little insectivorous bats, in that they eat insects which is actually the reason why they're in decline here in England and Wales, although they are actually doing okay on in Ireland, due to a loss of a lot of large insects here in
00:25:38.000 --> 00:25:44.000
Britain, due to development, lots of wetlands and areas that insects generally grow in and live in because we've lost those insects.
00:25:44.000 --> 00:25:49.000
And we also because we've lost a lot of forestry forests in woodland habitat.
00:25:49.000 --> 00:25:57.000
That's such as Leisler's Bat is, doing quite poorly at the moment their populations are starting to go down there.
00:25:57.000 --> 00:26:07.000
The species in particular, as well as really sensitive to some of the chemicals that we use to treat wood and things like decks and sort of back patios, and those sorts of things.
00:26:07.000 --> 00:26:11.000
So they're doing basically, they're doing poorly.
00:26:11.000 --> 00:26:15.000
And their populations are starting to go down.
00:26:15.000 --> 00:26:19.000
A species that is starting to go down and continue to get worse.
00:26:19.000 --> 00:26:30.000
If we continue business as normal is the brown hair streak, and these ones are this butterflies mostly declining because of a loss of hedgerows here in Britain.
00:26:30.000 --> 00:26:46.000
So instead of the traditional hedgerows we use as fence lines, and in between fields and along roads, we've been using fences instead and brown hair streaks have declined drastically because they use blackthorn to lay their eggs in they exclusively lay their
00:26:46.000 --> 00:26:53.000
eggs in blackthorn and blackthorn makes a great hedgerow, so it would generally be as the decline.
00:26:53.000 --> 00:27:01.000
In hedgerow, we seen a decline in black thrown across Britain, and as such a decline in brown hair streaks as well which is really highlights.
00:27:01.000 --> 00:27:06.000
One of the reasons why hedgerow conservation is incredibly important here in Britain.
00:27:06.000 --> 00:27:17.000
There's a lot of species, brown hair streaks or hedgehogs that really use hedgerows and heavily adapted to that type of environment to live in.
00:27:17.000 --> 00:27:26.000
A species that's endangered here in the UK, due to habitat loss, but also due to predation by other birds that are thriving due to humans.
00:27:26.000 --> 00:27:38.000
But are of least concern globally, are willow tits, and this kind of shows the interesting one to show that there are some winners and some losers when it comes to human development.
00:27:38.000 --> 00:27:56.000
Peregrine falcons, for instance, are doing incredibly well lately, because, instead of nesting in high trees and cliffs like, they would historically, they're now nesting on tall buildings so if you're a perigrine falcon there's more and more habitat being developed as
00:27:56.000 --> 00:28:13.000
we build more and more tall buildings and towers. The problem is, though, if you have lots and increase in the number of predators in a system, you start to have a decrease in the number of prey, and a lot of bird prey are predator birds eat tits, especially willow tits so their populations.
00:28:13.000 --> 00:28:18.000
Are decreasing quite drastically, I have an estimate here that their population is decreased.
00:28:18.000 --> 00:28:24.000
64% in the last 10 years, just quite dramatic, so will it turn endangered here in Britain.
00:28:24.000 --> 00:28:30.000
They're doing okay, globally, though.
00:28:30.000 --> 00:28:36.000
And finally, what I think is one of the more exciting species on this list, although it's they're critically endangered.
00:28:36.000 --> 00:28:45.000
Are the Scottish wild cats. I have a link here, and it is in the list of resources I have available at the end of this good.
00:28:45.000 --> 00:28:50.000
There's a great. There's great documentary on groups trying to save the Scottish wildcat.
00:28:50.000 --> 00:29:00.000
And one of the reasons why Scottish wildcats are doing so poorly is because, as you can tell by this photo, they look incredibly similar to a domestic tabby cat which is part of the problem.
00:29:00.000 --> 00:29:06.000
They keep being treated as if they are feral cats being removed, except they're not.
00:29:06.000 --> 00:29:14.000
They're wild cats, they will attack you. These guys they're subspecies of the European wildcat.
00:29:14.000 --> 00:29:22.000
They can interbreed with domestic cats, so you can end up with hybrids, but they are wild, they are native, they are the largest predator here in the UK.
00:29:22.000 --> 00:29:30.000
So keep an eye out for them. There are. There's a few different features.
00:29:30.000 --> 00:29:32.000
If you're interested, I can show some photos later.
00:29:32.000 --> 00:29:40.000
If these guys have kind of more square heads compared to a domestic cat, and they're also a bit more stocky and generally not too keen on humans.
00:29:40.000 --> 00:29:51.000
If you call one over it will definitely run away, and then finally, an example of a species that's been extirpated here in Britain, which means it's been.
00:29:51.000 --> 00:29:54.000
It's extinct in Britain, though it does.
00:29:54.000 --> 00:29:58.000
It is living elsewhere? As the Eurasian wolf, so canis lupus lupus.
00:29:58.000 --> 00:30:05.000
I have here that they wolves were hunted out of Wales, and 1166.
00:30:05.000 --> 00:30:17.000
The last ones were hunted out of England in 1390, Scotland they survived until 1680, and then the last ones in Ireland actually lasted until 1786.
00:30:17.000 --> 00:30:24.000
So this is a species that's been extirpated for quite a while. The obvious reason that people are generally concerned about them with farm animals, although they're still common in Eastern Europe, Russia and Scandinavia.
00:30:24.000 --> 00:30:34.000
So the population is doing okay globally. I know.
00:30:34.000 --> 00:30:48.000
And and issuing to talk more in the. And when we get to questions and discussion at the end, I know there's lots of discussion about whether or not to bring wolves back, whether or not they should be reintroduced in Scotland, lots of pros and cons associated with that so we can be able to talk more
00:30:48.000 --> 00:30:53.000
about that kind of an interesting topic.
00:30:53.000 --> 00:31:00.000
So? Why is Bio diversity decreasing? Why do we have so many of these endangered, critically endangered and near-threatened species?
00:31:00.000 --> 00:31:09.000
A couple of reasons. One of the largest is just habitat alteration, so mostly caused by clearing land for us, and it's not just forests.
00:31:09.000 --> 00:31:22.000
All ecosystems being converted into agriculture, which really does highlight a need to figure out how to grow food more efficiently than we do currently to keep up with our large growing population.
00:31:22.000 --> 00:31:31.000
And sort of a way to think about. It is land and land available for agriculture in a lot of ways is a non renewable resource.
00:31:31.000 --> 00:31:34.000
It's limited. There's only so much of it out there.
00:31:34.000 --> 00:31:40.000
I have one stat here that at least in the United States, that 99% of all of the grassland prairie in the US.
00:31:40.000 --> 00:31:44.000
Has been converted into agricultural fields.
00:31:44.000 --> 00:31:49.000
So we've the us at least has lost 99% of all of its prairie.
00:31:49.000 --> 00:31:52.000
The statistics are much lower here in Britain, but it is kind of brings up.
00:31:52.000 --> 00:32:00.000
The question should be be using all of our land to grow food. Is there a way to do it a bit more efficiently?
00:32:00.000 --> 00:32:06.000
A lot of species are also having issues because they're having to face competition with non-native species.
00:32:06.000 --> 00:32:22.000
Species, such as grey squirrels, which one are ones that, like a lot of people, are familiar with other ones, though such as the Egyptian goose, which was introduced in the eighteenth century, the Chinese muntjac deer, which was introduced in the twentieth century
00:32:22.000 --> 00:32:34.000
and the Chinese mitten crab, which is also introduced in the but the nineteenth century, though it was started to use, even be found in the Thames in the twentieth century.
00:32:34.000 --> 00:32:37.000
Most of these non native species come to Northern Europe through by way of transit and trade.
00:32:37.000 --> 00:32:44.000
Sometimes they come in the ballast water of ships, other times they can be escapees from food, food, shipments.
00:32:44.000 --> 00:32:57.000
You have insects that can bore themselves until lumber that's being imported from abroad, or quite a few of them, as most the ones here that I've shown you are.
00:32:57.000 --> 00:33:12.000
We're brought here on purpose. Grey squirrels, for instance, were brought over from North America because it was considered fashionable to have on a States, and as we know, they've really displaced a lot of the Native Red squirrels who are now only found in Scotland same goes for
00:33:12.000 --> 00:33:18.000
the muntjac deer originally brought here for hunts, but now are running rampant.
00:33:18.000 --> 00:33:26.000
Don't really have native predators. They're eating lots of bark off of developing trees, which is really destroying forests across Britain.
00:33:26.000 --> 00:33:31.000
So really troublesome species.
00:33:31.000 --> 00:33:48.000
Pollution is also a large issue. One. It's really a tremendous issue, especially in aquatic environments, because species that live in water are just more sensitive to pollutants cause it's surrounding them at all times versus skin and membranes.
00:33:48.000 --> 00:33:51.000
What not on land offer a bit more protection this is one of the reasons why you may hear of. You know.
00:33:51.000 --> 00:33:58.000
Frogs, for instance, and other amphibians, as being the sort of canary in the coal mines.
00:33:58.000 --> 00:34:04.000
For pollution, examples of pollution impacting the environment.
00:34:04.000 --> 00:34:07.000
If you think back to the 1960 s. Seventies, DDT.
00:34:07.000 --> 00:34:17.000
Which was used to kill off mosquitoes cause thinning, and eggshells in birds, which cause massive crashes and bird populations across the globe.
00:34:17.000 --> 00:34:27.000
Things like nutrient pollution, so runoff from farms, causing algal blooms which can increase snails, which then increases parasites which then impacts frogs.
00:34:27.000 --> 00:34:36.000
It's another example of how everyone in the ecosystem is connected. And all of these inputs and outputs.
00:34:36.000 --> 00:34:40.000
2 more reasons before we start to get into why biodiversity is important.
00:34:40.000 --> 00:34:44.000
Another reason why it's decreasing, though, is over harvesting.
00:34:44.000 --> 00:34:47.000
We're great at eating things to extinction.
00:34:47.000 --> 00:35:05.000
Fabulous at it. Shark fins from shark fin soup to, you know, tigers, skins, and body parts being used to, especially the black rhino, and also the white rhino we're really good at killing off things to eat them and to use their body parts this is
00:35:05.000 --> 00:35:21.000
a tremendous issue, especially in a lot of tropical regions as well, and it's also a global issue, because a lot of times the markets for these animal products are not the countries and not the regions where they're being collected from so for instance, in the white rhino poaching market
00:35:21.000 --> 00:35:33.000
rhinos are being harvested from, you know, a lot of African nations Mozambique, South Africa, and then being sold on to other destinations abroad.
00:35:33.000 --> 00:35:44.000
So it's there's some interesting economics associated with this burning need, like global legislation, to really tackle these issues and to go after the buyers, not just the hunters.
00:35:44.000 --> 00:35:50.000
That said one of the solutions to this, especially when it comes to the non-native species.
00:35:50.000 --> 00:35:54.000
It's trying to encourage people to actually eat the non-native species.
00:35:54.000 --> 00:36:05.000
There's a very large push in North America, for instance, to try to encourage people to eat Asian carp, which is an introduced fish species, which is a really common food fish in each East Asia but it's considered a nuisance in North America.
00:36:05.000 --> 00:36:14.000
Trying to increase that. So over harvesting, it's a curse, but it could potentially be a tool to manage non-native species.
00:36:14.000 --> 00:36:21.000
And then finally the large overarching issue that we're all dealing with, not just about biodiversity, but with all environmental issues.
00:36:21.000 --> 00:36:27.000
Really is climate change. Some species can adapt to climate change.
00:36:27.000 --> 00:36:33.000
The problem is climate change currently is occurring faster than normal background rates.
00:36:33.000 --> 00:36:52.000
So normally, when you have things like the melting of the ice caps and sort of more natural or glacial areas and non-glacials, and the sort of natural cycles species do adapt to that, because those changes are really slow and drawn out the problem is with human caused
00:36:52.000 --> 00:37:00.000
climate change. It's just happening incredibly fast. And organisms they can try to migrate into cooler areas, into areas that suit them. Still.
00:37:00.000 --> 00:37:11.000
But they just can't keep up tree species, for instance, need millennia to move farther north and south, and to stay in their ideal conditions.
00:37:11.000 --> 00:37:12.000
But instead, we are seeing climate change on the course of centuries, if not decades.
00:37:12.000 --> 00:37:19.000
So they just can't keep up.
00:37:19.000 --> 00:37:25.000
So that's a lot of bad news uplifting thing to hear on a Thursday afternoon.
00:37:25.000 --> 00:37:37.000
But I do have a few reasons why we should value biodiversity, which also highlight tools that we can use to try to encourage people to follow by a diversity more and work harder at trying to protect it.
00:37:37.000 --> 00:37:44.000
So why is biodiversity important? The first reason is something that is called the insurance Hypothesis.
00:37:44.000 --> 00:37:56.000
So generally diverse communities, diverse ecosystems, areas with really high biodiversity are just more stable and a great way to show you this is this little diagram that I have here.
00:37:56.000 --> 00:38:00.000
So take, for example, we had 3 different islands for 3 different communities.
00:38:00.000 --> 00:38:08.000
Whichever works better in your head, one is gonna be dominated just by a green species, and this one does really well in warm weather.
00:38:08.000 --> 00:38:11.000
The second one is gonna be dominated by a blue species.
00:38:11.000 --> 00:38:19.000
This one does really well in cold weather, and the finally, there's a third area that has both the blue-green blue species and a green species.
00:38:19.000 --> 00:38:29.000
So the warm one and the cooler one. So when you have changes in climate like we're seeing now your warm years, cold years, things crashing up and down quite rapidly.
00:38:29.000 --> 00:38:34.000
If you have an island where only the speed where that only has warm, adapted species.
00:38:34.000 --> 00:38:38.000
If you have a cold snap, so just, you know, here in the year 3.
00:38:38.000 --> 00:38:40.000
Okay, a lot of individuals will die off because of that. You can end up with a lot of empty niches.
00:38:40.000 --> 00:38:58.000
That's a lot of empty space and ecosystem, that's not quite functioning the way it should be and the same goes for if you have, say, a blue community that's only dominated by species that grow really well in cold climates if you have a heat, wave it may go in there
00:38:58.000 --> 00:39:06.000
kill out half the species and you end up with like a kind of a dysfunctional non working ecosystem.
00:39:06.000 --> 00:39:15.000
If, instead, you have a diverse community that has both, you know, green species, blue species, orange purple, red, etcetera, that are all adapted to different environments.
00:39:15.000 --> 00:39:21.000
That community that island, that forest, for instance, can deal with whatever is thrown at it.
00:39:21.000 --> 00:39:22.000
So if you have a heat wave, sure you may lose some of the blue species, but the green ones grow better.
00:39:22.000 --> 00:39:29.000
We'll sort of fill up those gaps and say, if you have a cold snap of cold, a frost.
00:39:29.000 --> 00:39:43.000
That's a bit early. Lot of the green individuals die off. The blue can kinda come in there and sort of fill the gaps that'd be left behind.
00:39:43.000 --> 00:39:48.000
So, that's a bit of a it's sort of an abstract example of that.
00:39:48.000 --> 00:40:05.000
But I have a really great example of that in action here in London last year, during the 2020 drought, so I've got photos here from friends here in London the first one on the left is of Greenwich Park and then on the right is State Hill Ecological Park, so Greenwich Park if you've been there
00:40:05.000 --> 00:40:06.000
before it's just. It's a monoculture.
00:40:06.000 --> 00:40:14.000
It's your traditional sort of Grass Park, if you you know token trees out and about but it's a monoculture.
00:40:14.000 --> 00:40:21.000
It only really contains one or 2 species, and, as you can see here during that heat wave, it died out.
00:40:21.000 --> 00:40:26.000
It was very dead. It was crispy. There incredibly lots and lots of bare patches really.
00:40:26.000 --> 00:40:32.000
Wasn't that functional? And he can compare that to something like the State Hill Ecological Park, which is only half hour.
00:40:32.000 --> 00:40:36.000
Bus ride away quite close by on the Rotherhithe Peninsula.
00:40:36.000 --> 00:40:53.000
Here in London, and it has a lot of maintained wildflower meadows that are sort of taken care of to promote diversity and a lot of natural wildfire species that are native here to Britain, and even though there's a heat wave a lot of them, are still green it's a bit hard to
00:40:53.000 --> 00:41:04.000
tell them the photos a bit artistic, but we still had wildflowers that were growing well, and because there were some species there that could cope with that heat wave, even though not all of them could.
00:41:04.000 --> 00:41:07.000
It was still functional. There were still, you know, more birds in the one shown here in their eating.
00:41:07.000 --> 00:41:16.000
There were still butterflies. The bees were still being able to get some food wasn't great, but it was still functional.
00:41:16.000 --> 00:41:29.000
Then, because it was maintained for biodiversity, it just maintained a much more functional ecosystem than something like maintained monoculture like Greenwich Park.
00:41:29.000 --> 00:41:34.000
Another reason why biodiversity is important has to do with something that are called ecosystem services.
00:41:34.000 --> 00:41:37.000
So these are the way. Think about ecosystem services is these are jobs that the environment does for us.
00:41:37.000 --> 00:41:47.000
And these jobs are really only maintained and continued through high biodiversity.
00:41:47.000 --> 00:42:02.000
So where's ecosystem functions are sort of the scientific thing, like the nitty gritty bits of how ecosystems work the things that scientists like myself study ecosystems goods and services are the benefits that people that we
00:42:02.000 --> 00:42:07.000
derive from these ecosystems. In these can be direct, they can be indirect, but they help us.
00:42:07.000 --> 00:42:12.000
They're basically jobs that the environment is doing for us for free.
00:42:12.000 --> 00:42:16.000
This may seem a bit confusing, so I have some examples that make it a lot clearer.
00:42:16.000 --> 00:42:21.000
So generally when we talk about ecosystems, they're usually broken down into 4 subcategories.
00:42:21.000 --> 00:42:26.000
So there's provisioning ones. The regulating services, cultural services.
00:42:26.000 --> 00:42:30.000
And then finally supporting services.
00:42:30.000 --> 00:42:39.000
Provisioning services are just things that the environment, that healthy diverse ecosystems provide for us, for free in a lot of ways.
00:42:39.000 --> 00:42:44.000
Think about food, sunlight for energy, the fact that we have water minerals that we can use for all sorts of things, or even just, you know, medicinal compounds.
00:42:44.000 --> 00:43:03.000
You know everything from enzymes that people with digestive issues use to antibiotics, to, you know, aspirin from willow a lot of the compounds that we now can synthesize to make medicines originate in the natural world.
00:43:03.000 --> 00:43:12.000
Were discovered in plants and animals, and you know other places.
00:43:12.000 --> 00:43:23.000
The regulating ecosystem services. These are gonna be ones that help maintain our environment, keep it functioning things like decomposition some of the reasons why we're not up to our ears.
00:43:23.000 --> 00:43:30.000
And you know, dead animal material, water, purification is a really big one.
00:43:30.000 --> 00:43:36.000
CO2, sequestration, pest control, a really big one is flood prevention.
00:43:36.000 --> 00:43:50.000
Wetlands and across the globe do a lot of heavy lifting at preventing floods, and when we start to develop over and pave over and build over our wetlands that's when we start to have an increase in floods because we're removing that sort of sponge from
00:43:50.000 --> 00:43:56.000
the environment that helps prevent these floods from happening. In the first place.
00:43:56.000 --> 00:44:04.000
There are cultural ecosystem services, these are the sort of non material benefits that we get that enriched human experience.
00:44:04.000 --> 00:44:13.000
Things like recreation, arts, education from the environment, even just like a spiritual sense, just being able to go out and just enjoy the environment.
00:44:13.000 --> 00:44:20.000
These are all services that healthy, diverse ecosystems provide for us.
00:44:20.000 --> 00:44:30.000
And finally, we have. What are the supporting services, and these are just the source, the services, the processes that healthy, diverse ecosystems provide us, that help maintain life on this planet.
00:44:30.000 --> 00:44:44.000
Again, decomposition is considered one, but also soil formation that we can grow food and soil, that in that that's soil will be regenerated or just photosynthesis.
00:44:44.000 --> 00:44:45.000
And another way to think about it is ecosystem.
00:44:45.000 --> 00:44:48.000
Services are all those things that the earth takes care of for us, but things we don't even have to think about while we're living on Earth.
00:44:48.000 --> 00:45:09.000
But are going to require a massive team of engineers, and you know, decades worth of development, and millions, if not billions of pounds to develop, to take, to save space the things that we don't have to worry about here, but on say, the artemis moon mission we're gonna have to develop ways to process
00:45:09.000 --> 00:45:22.000
our water to grow, our food to, you know, scrub our air, to get the carbon dioxide out of it, and maintain high levels of oxygen so all the things we don't have to think about here.
00:45:22.000 --> 00:45:26.000
Oh, require an entire team of engineers to work on in space.
00:45:26.000 --> 00:45:31.000
Those are the ecosystem services.
00:45:31.000 --> 00:45:36.000
And finally, the last reason, real big reason why we should care about biodiversity.
00:45:36.000 --> 00:45:43.000
We like it. Humans like being outside these.
00:45:43.000 --> 00:45:48.000
You may have heard of the famous ecologist EO Wilson. I'm not seeing on some documentaries.
00:45:48.000 --> 00:45:57.000
He developed an idea called biophilia, which states that humans, we subconsciously seek out nature we'd like to be around other life.
00:45:57.000 --> 00:46:02.000
And his evidence for this that he provided is, you know, we've created parks.
00:46:02.000 --> 00:46:04.000
We have pets. We keep animals in our homes.
00:46:04.000 --> 00:46:10.000
We value real estate, that have beautiful views. We go hiking and tied to.
00:46:10.000 --> 00:46:26.000
This is an idea, a bit controversial, but it's an idea called nature deficit disorder, which is developed by a by someone named Richard Louv, where the idea that if you have children who are deprived of nature and connection to other species that you may actually these kids may
00:46:26.000 --> 00:46:30.000
actually end up with emotional and physical problems because of that.
00:46:30.000 --> 00:46:35.000
And he actually argues that some of the problems that may be plaguing us here in a lot of developed Western countries.
00:46:35.000 --> 00:46:37.000
You know things like obesity. ADHD. Depression.
00:46:37.000 --> 00:46:41.000
Myopia may be, I would argue strongly that are not caused by, but maybe definitely made worse by a lack of time in the environment.
00:46:41.000 --> 00:46:50.000
But there is lots of debate around this. I do recommend checking out his book, though.
00:46:50.000 --> 00:46:56.000
At least for the debate purposes.
00:46:56.000 --> 00:46:59.000
If I had to wrap up my last slide before we get to questions.
00:46:59.000 --> 00:47:09.000
Here is just the idea that you know. Do we have an ethical responsibility towards other species to help maintain these healthy, you know, maintain high levels of biodiversity.
00:47:09.000 --> 00:47:13.000
And really, this is up to philosophical debate.
00:47:13.000 --> 00:47:16.000
I would argue, so personally, I think we do have an obligation to care for them.
00:47:16.000 --> 00:47:25.000
But this could lead to an incredibly long philosophical, and even theological debate, and just 2 sides of this, that you will see around in this debates.
00:47:25.000 --> 00:47:41.000
You have something like the writer, like Aldo Leopold who stayed in his book, sent called The County Almanac. If you haven't read his lovely but the last word of ignorance is the man who says of an animal or plant, what good is, it and he can contrast that to the
00:47:41.000 --> 00:47:50.000
former president of the US. Ronald Reagan he said. Quote, if I mean, if you've looked at a hundred 1,000 acres of or so of trees, you know a tree is a tree, how much more do you need?
00:47:50.000 --> 00:47:53.000
So there is ignorance out there, and it is something we need to work out.
00:47:53.000 --> 00:48:00.000
But I think this idea of using this idea of ecosystem services as a jumping off point shows to people who even intrinsically made.
00:48:00.000 --> 00:48:04.000
You know, not necessarily value diversity may show them reasons why.
00:48:04.000 --> 00:48:13.000
I'm sure to lift the veil on that. And with that I believe I've got about 10 min for questions, if not a bit more.
00:48:13.000 --> 00:48:17.000
I don't mind staying a little bit after. Thank you for that.
00:48:17.000 --> 00:48:18.000
Do let me know if you have any questions about the content.
00:48:18.000 --> 00:48:29.000
Many questions about the ideas. If you'd like to follow up, I will be teaching some my quick plug before Fiona jumps in here is that I will be.
00:48:29.000 --> 00:48:30.000
I should be teaching some courses in the fall on green issues.
00:48:30.000 --> 00:48:37.000
So if you do want to drop in on those, I can let you know, but otherwise thank you very much.
00:48:37.000 --> 00:48:41.000
And I'll turn it over to Fiona with questions.
00:48:41.000 --> 00:48:46.000
Thanks thanks very much, Audrey. That's really really interesting and really important stuff, isn't it?
00:48:46.000 --> 00:49:00.000
Okay, so we've got a question here. And I think if everybody's been absolutely riveted by what you've been saying I've got a question here from Liz she's saying, and I'm sure there is no silver bullet to increase biodiversity.
00:49:00.000 --> 00:49:05.000
But what measures should we prioritize the protection of habitats rewilding our gardens?
00:49:05.000 --> 00:49:11.000
Improving farming methods. Introduction of species, such as Beavers.
00:49:11.000 --> 00:49:20.000
I think, protecting what we have in the first place, is a real big one, cause it's it takes more effort to replace something that's gone than it is to just protect stuff.
00:49:20.000 --> 00:49:37.000
In the first place. So if we can try to protect the areas of Britain that are still wild, that would be my first step would be make sure that those are rock solid, safe, or protected from development from there, you can start to expand out and sort of look at the nearby areas because one of the funny, things about
00:49:37.000 --> 00:49:40.000
biodiversity is biodiversity. You get the best results when areas are connected to one another, and you end up with a big, long network.
00:49:40.000 --> 00:49:52.000
So one of the reasons why, even here in London and other cities, all those little pocket parks that they have, they're nice, but they don't really work that.
00:49:52.000 --> 00:50:10.000
Well, you need sort of interconnected spaces. So once you really really locked down the conservation of the areas that we already have, then look at the surrounding areas and see how you can increase the functionality there and sort of go outwards from there and also in by protecting the areas
00:50:10.000 --> 00:50:16.000
we have. I think this really is gonna have to lead to things like more intense development in areas that are already developed.
00:50:16.000 --> 00:50:23.000
So just trying to avoid developing on land that's already or to avoid developing on land that has not been developed before.
00:50:23.000 --> 00:50:25.000
So if it's it's gonna sound kind of terrible.
00:50:25.000 --> 00:50:31.000
But it's already been spoilt. Focus on that. Just try to keep the wild areas still wild.
00:50:31.000 --> 00:50:38.000
Above all else, that would be my first first task if given the ability to come up with policy.
00:50:38.000 --> 00:50:43.000
I suppose that the rewilding thing it's quite controversial, isn't it?
00:50:43.000 --> 00:50:47.000
It is, and and I see it's one of those things where I understand.
00:50:47.000 --> 00:50:51.000
I have empathy for both sides of the issue, and rewilding can work.
00:50:51.000 --> 00:50:58.000
It depends on the way it's done, and it really needs to be used sort of like with that scientific lens.
00:50:58.000 --> 00:50:59.000
Looking at that functionality and really targeting. Okay, why are we?
00:50:59.000 --> 00:51:05.000
Why are we rewilding? What areas are we doing this in?
00:51:05.000 --> 00:51:09.000
Is this the best place for it, etc.
00:51:09.000 --> 00:51:10.000
Yeah.
00:51:10.000 --> 00:51:15.000
Hmm! This may be links into question. It's just actually come in from Carolyn, this kind of related to what you put you've just been saying.
00:51:15.000 --> 00:51:22.000
She's asking would you be able to summarize the benefits or otherwise of reintroducing lynx or wolves to the UK.
00:51:22.000 --> 00:51:27.000
And has Europe had any problems with the increase in these species?
00:51:27.000 --> 00:51:28.000
We thought so on that.
00:51:28.000 --> 00:51:30.000
I told them the examples. And yeah, so the reason?
00:51:30.000 --> 00:51:33.000
And there's a really good I'll send it after.
00:51:33.000 --> 00:51:39.000
There's a really good video that explains this better than I can in a minute or 2.
00:51:39.000 --> 00:51:46.000
But wolves, and these other links in these big top predators they're called something. There's something called keystone species.
00:51:46.000 --> 00:51:49.000
And these are species that you don't need a lot of them.
00:51:49.000 --> 00:51:53.000
But you just need a couple because they're really, really important to that system.
00:51:53.000 --> 00:52:02.000
And what they've found is, if you can reintroduce wolves or lynx, or other predators, they'll help decrease the number of prey and animals in an area.
00:52:02.000 --> 00:52:08.000
So the number of deer, for instance, which is great because deer are actually really terrible for forests.
00:52:08.000 --> 00:52:09.000
Yeah.
00:52:09.000 --> 00:52:14.000
They eat bark, they eat little young trees, and they can really really impact forests.
00:52:14.000 --> 00:52:19.000
So if you decrease the number of deer back to sort of traditional levels.
00:52:19.000 --> 00:52:30.000
You then will have healthier forests, and when you have healthier forests, that's when you start to see the birds are going to come back the bees are going to come back beavers actually come back, they found this in the US.
00:52:30.000 --> 00:52:45.000
When they reintroduced wolves, at the number of beavers they found increased quite drastically, because they had healthier forests and they're able to build up dams again, and whatnot, and it doesn't take a lot that's the thing it only takes a few and I
00:52:45.000 --> 00:52:50.000
know, there's issues surrounding agriculture, and especially with farm animals and people being concerned.
00:52:50.000 --> 00:52:54.000
And I think a lot of that is just sort of supporting farmers to take that hit.
00:52:54.000 --> 00:52:59.000
I think, in just sort of government, stepping in and being like, Hey, we know that you're going to lose X, y, and Z.
00:52:59.000 --> 00:53:10.000
You know a few cattle, a few sheep. But here's compensation to make up for that, and just sort of incorporating that into the program because they are important and it just ends up being healthier all around.
00:53:10.000 --> 00:53:14.000
If you just have a couple of those predators, just because everything's connected but yeah, if you're remind me at the end, I will add it to my list of links.
00:53:14.000 --> 00:53:21.000
There's a really good video that explains it in the context of in the context of Yellowstone National Park in the Us.
00:53:21.000 --> 00:53:34.000
Where they've done this study. They got rid of wolves in the 1930s, and they brought them back recently, and the park is much, much, much more functional and healthier.
00:53:34.000 --> 00:53:35.000
Now, yeah, it's a good question.
00:53:35.000 --> 00:53:41.000
Okay. Yeah, and here's the question from Pearl.
00:53:41.000 --> 00:53:42.000
Hello!
00:53:42.000 --> 00:53:46.000
I'm sure you know Pearl. What's your view on invasive species?
00:53:46.000 --> 00:53:55.000
Should we try and eliminate them, or do we let nature take its course?
00:53:55.000 --> 00:53:56.000
Hmm!
00:53:56.000 --> 00:53:58.000
That's a tricky one. The problem with invasive species is they can really disrupt things.
00:53:58.000 --> 00:54:08.000
But at the same time, once they get embedded, it's almost like a losing game like, no matter how many, no matter how much effort you put into save removing grey squirrels in England, it's like this endless thing.
00:54:08.000 --> 00:54:15.000
You can never win. So I think there's some interesting ways to go about getting rid of them.
00:54:15.000 --> 00:54:17.000
A fun one to look up is something called an invasive war.
00:54:17.000 --> 00:54:29.000
It's invasive, or as in like a food, lifestyle, that is generally trying to eat our way out of the problems and trying to increase demand for some of these invasive species.
00:54:29.000 --> 00:54:30.000
Hmm!
00:54:30.000 --> 00:54:42.000
I think other big ones are just trying to prevent new ones from coming into so really cracking down on things like shipments and whatnot, almost taking Australia and New Zealand have done great at preventing this.
00:54:42.000 --> 00:54:46.000
As you know, they've been decimated by say, like rabbits and rats.
00:54:46.000 --> 00:54:51.000
But if you look at their sort of legislation for plan, animal material coming into the country, it's incredibly incredibly strict, and that's really prevented a lot.
00:54:51.000 --> 00:55:08.000
Their problems from getting worse but it's a really tricky one, because I know you could spend lifetimes pulling out invasive plants and hunting down squirrels, doing these things.
00:55:08.000 --> 00:55:09.000
So it's that's a really tough one.
00:55:09.000 --> 00:55:11.000
Yeah.
00:55:11.000 --> 00:55:14.000
Yeah, and was mentioning Japanese, knotweed.
00:55:14.000 --> 00:55:15.000
Hmm!
00:55:15.000 --> 00:55:18.000
Yeah, again, it's just trying to prevent it.
00:55:18.000 --> 00:55:19.000
Prevent them in the first place. But then, yeah, trying to be really targeted as well.
00:55:19.000 --> 00:55:28.000
Like going after the areas. So, for instance, I'd be less concerned about them going a bit wild and really urban areas.
00:55:28.000 --> 00:55:36.000
But the focusing more so on the natural ones, more the countryside in those areas that are being rewired to really make sure that they don't have, that you can kind of knock them down in those areas.
00:55:36.000 --> 00:55:41.000
So, being really targeted with it.
00:55:41.000 --> 00:55:45.000
Hmm, you talked about problems with rabbits and rats.
00:55:45.000 --> 00:55:48.000
We've got a question here from Marilyn how their retirement village intends to try and increase?
00:55:48.000 --> 00:55:55.000
Its biodiversity. But they have a real problem with with rabbits and rats.
00:55:55.000 --> 00:55:59.000
So how do they differentiate between good and bad biodiversity?
00:55:59.000 --> 00:56:17.000
This is a good one, because there's actually there's so even a category kind of going back to the invasive species to where they're also nuisance species which are native to Britain.
00:56:17.000 --> 00:56:18.000
Hmm!
00:56:18.000 --> 00:56:19.000
But there's just too many of them at the moment, because of just the way human activity and Hello, Marilyn, from one of my classes, I think it's again looking at that.
00:56:19.000 --> 00:56:23.000
Even this thing, too. So things like rabbits and rats.
00:56:23.000 --> 00:56:31.000
Yes, you need a few of them, but, my lord, my word, if if allowed to go out of control untouched, can cause a lot of damage themselves.
00:56:31.000 --> 00:56:50.000
So, not every just because I would say, just because a species is native doesn't mean it's not a nuisance, for instance.
00:56:50.000 --> 00:56:51.000
Hmm!
00:56:51.000 --> 00:56:53.000
So yeah, rabbits in rats again. Too many of them because of human activity, partly because there's not a lot of predators and people don't hunt that them that much anymore.
00:56:53.000 --> 00:56:55.000
It's the same with the deer as well, since it hmm!
00:56:55.000 --> 00:57:04.000
Same with the deer. So the deer issue with our forests was maintained when hunting deer was considered in vogue, and people were doing it as a food source.
00:57:04.000 --> 00:57:08.000
But because that's not really done anymore. The populations have gone sort of create.
00:57:08.000 --> 00:57:12.000
So you gotta figure out you need to keep those animals like deer rabbits, rats.
00:57:12.000 --> 00:57:20.000
They need to be either kept in check by nature, or kept and checked by people, and currently, we're doing neither and that's why they're sort of going crazy.
00:57:20.000 --> 00:57:21.000
So, yeah.
00:57:21.000 --> 00:57:25.000
Yeah, okay, but we've got 2 more questions, and then we'll wrap up.
00:57:25.000 --> 00:57:37.000
Okay, this one from she thinks that one of the problems is that every generation gets used to what is around them in their times and doesn't see the decrease.
00:57:37.000 --> 00:57:41.000
How, how can we deal with that?
00:57:41.000 --> 00:57:42.000
It's a tough one, and I think a lot of it.
00:57:42.000 --> 00:57:43.000
Big question?
00:57:43.000 --> 00:57:50.000
Big question as someone who also works in a school, and I think one of the big answers is just get kids outside a hundred percent.
00:57:50.000 --> 00:57:53.000
I mean, I work here in Hackney, which isn't exactly the most.
00:57:53.000 --> 00:57:57.000
There's some green spaces, but it's pretty built up, and it's tough, and I think the real big thing is just trying to get kids in the environment.
00:57:57.000 --> 00:58:06.000
Try to get everybody out there, and just seeing what they are missing in building up the appreciation for it.
00:58:06.000 --> 00:58:09.000
So one of the things I do here, at least in the school.
00:58:09.000 --> 00:58:19.000
My sort of day job is I'm a Duke of Edinburgh, mentor, and leader, and just yeah, some of these kids I work with students who just they've never been outside of even Hackney, the borough, which is a very small area.
00:58:19.000 --> 00:58:27.000
So taking them outdoors and just seeing what they're missing, I think, can really build up an appreciation of that.
00:58:27.000 --> 00:58:35.000
Even just little things, just like having a garden working on the allotment going bird watching in a city park.
00:58:35.000 --> 00:58:41.000
All of those little activities, especially if you start really young and really start to work with small children to build up that appreciation.
00:58:41.000 --> 00:58:49.000
Maybe, instead of sitting inside, going outdoors to the park, things like that can really drastically increase their appreciation of that.
00:58:49.000 --> 00:58:59.000
And I know not. Everyone can go off and just go camping in the countryside for weeks on end, but just trying to do those full things and appreciate the nature that you have around around you.
00:58:59.000 --> 00:59:06.000
I've taken a bird watching here in London, and I am absolutely shocked at the diversity of birds that they're here.
00:59:06.000 --> 00:59:20.000
It's phenomenal and even just the things that you can see just walking down, and the little city parks so really trying to build that up from youth. And that's why it kind of goes back to sort of a lot that last child in the woods idea I think there are some
00:59:20.000 --> 00:59:25.000
there's a lot of controversies around it, because I think the author of that book associates a lot of sort of medical diagnoses with that, and I don't think that's quite it.
00:59:25.000 --> 00:59:28.000
I think it's more of a cultural thing. We just need to get out.
00:59:28.000 --> 00:59:32.000
Get outdoors. That's my 2 cents.
00:59:32.000 --> 00:59:39.000
Hmm, okay. Great. Okay. One more question. This is a bit of a biggie as well.
00:59:39.000 --> 00:59:41.000
Actually, it'd be interesting to get your thoughts on it.
00:59:41.000 --> 00:59:47.000
This is from. Are there too many humans for the planet to support?
00:59:47.000 --> 00:59:48.000
Is there really nothing we can do about it?
00:59:48.000 --> 00:59:51.000
Hmm! This is a tricky one. So this is a funny one.
00:59:51.000 --> 00:59:55.000
So, there's a lot of people. This is, I. Actually, I could almost say I have an entire lecture on this.
00:59:55.000 --> 01:00:02.000
This is actually a really interesting question. So, yes, there are a lot of people.
01:00:02.000 --> 01:00:05.000
I think the problem isn't that there's too many people.
01:00:05.000 --> 01:00:22.000
The problem is, we use too much stuff. So if you look at the amount of resources consumed by somebody with a large lavish upper middle class, Western lifestyle, it's tremendous compared to even just a middle-class lifestyle and other more developing areas, and it's it's not that
01:00:22.000 --> 01:00:26.000
we should all be living, you know, down on the earth, and just, you know, stop buying everything.
01:00:26.000 --> 01:00:33.000
But I think we consume way too much, and I think that's the issue more so than just the number of people that we have.
01:00:33.000 --> 01:00:38.000
And starting to look at things like carbon footprints and trying to drastically decrease that.
01:00:38.000 --> 01:00:44.000
And there are ways to go about that and decrease that in ways that aren't actually as painful as you think.
01:00:44.000 --> 01:00:53.000
But when it comes to the number of people, the other kind of good news is, yes, our population keeps rising, but it's going to plateau statistically.
01:00:53.000 --> 01:00:57.000
We've been looking like scientists really looked at this.
01:00:57.000 --> 01:00:59.000
There's a good there's 2 good websites.
01:00:59.000 --> 01:01:05.000
If you want to look at this, the numbers one is called our world in data, their research group.
01:01:05.000 --> 01:01:10.000
I think they're housed in Oxford, but they're sort of more of an NGO type group.
01:01:10.000 --> 01:01:21.000
The, population, statistics and stuff. And you can see it will level off, and the other thing, too, is you don't even necessarily. It's kind of a fun math, quk for the day.
01:01:21.000 --> 01:01:26.000
The way population growth works is you don't even necessarily have to have fewer children.
01:01:26.000 --> 01:01:30.000
You just have to have them later in life to slow down population growth.
01:01:30.000 --> 01:01:40.000
So just the fact that kind of stereotypically, I guess. Generalise, millennials are having fewer children and having them later is gonna cause that to plateau quite quickly.
01:01:40.000 --> 01:01:44.000
So our population isn't nearly as out of control as you think.
01:01:44.000 --> 01:02:03.000
It would be just the way the numbers work. So having children in your thirties actually helps the environment a lot compared to having children in your twenties as do just having a few fewer kids and yet few fewer things, I had a this is gonna sound really like
01:02:03.000 --> 01:02:08.000
I'm really trying to plug here hard, but I had a course I taught, and probably will be teaching again in the autumn called Green Solutions, and there are lots of things you can do to help the environment.
01:02:08.000 --> 01:02:18.000
Even if it is just taking a train instead of a plane and just trying to live a little dimensionally.
01:02:18.000 --> 01:02:23.000
So it is not all dooming gloom, because if it was doing bloom we would have crashed by now.
01:02:23.000 --> 01:02:27.000
So there is hope, and yeah, our population is stabilizing.
01:02:27.000 --> 01:02:28.000
So!
01:02:28.000 --> 01:02:30.000
Okay.
01:02:30.000 --> 01:02:33.000
Yeah. It's it's not all bad news.
01:02:33.000 --> 01:02:34.000
Yeah.
01:02:34.000 --> 01:02:41.000
Oh, the other. The second website is, oh, one freaking the name of it off the top of my head.
01:02:41.000 --> 01:02:49.000
Gap, reminder, Gapminder as in like mine, the gap a research group based on out of Sweden that looks at like human development indices.
01:02:49.000 --> 01:02:59.000
And actually, they're quite fun, because their whole sort of stick is that the world's not as bleak as it is, and they use math and statistics to show that things are actually getting better.
01:02:59.000 --> 01:03:00.000
So, yeah.
01:03:00.000 --> 01:03:04.000
Yeah. Cool. Okay. Well, thanks. Again. Kj, that was fantastic. I hope you all enjoyed that.
01:03:04.000 --> 01:03:05.000
Hey! Welcome!
01:03:05.000 --> 01:03:09.000
I, know, taking away a good bit of food for thoughts after that on biodiversity, and why we really need to value it.