What Are The World’s Biggest Problems?

In September 2015, the United Nations launched their 15 year plan to make the world a better place. The 17 Sustainable Development Goals are focused on improvement and longevity, and are a focal point of The UN Week in New York City. Additionally, a number of Summits provide the opportunity for world leaders to cooperate in achieving these global goals. So, what exactly are the world’s biggest problems? Well, first and foremost, poverty is an inescapable issue for nearly all developing countries. Roughly 1 in 7 people around the world live on less than $1.25 a day, and nearly half of the global population lives on just $2.50. While about a third of the world’s poor are located in India, only 10 countries house 80% of the poorest people on earth.

Closely tied to poverty is the issue of hunger. Inadequate nutrition contributes to nearly half of all child deaths worldwide, and in regions like sub-Saharan Africa, one in four people are malnourished. As a result, nearly 800 million people do not have access to enough food to live healthy, active lives. Similarly, water and sanitation are absolute necessities. Yet nearly the same number of people without access to food, lack access to water. And a third of the world’s population risks disease by not having adequate sanitation. Another major issue for developing countries is a lack of educational opportunities. The UN predicted in 2011 that if all students had even basic reading skills, world poverty could be reduced by more than ten percent. But illiteracy is an asymmetrical problem, and affects considerably more women than men. Of roughly 780 million illiterate adults worldwide, two thirds are female. As a result, women have considerably fewer opportunities, and it hurts a country’s ability to progress economically without a fully educated workforce.

This inequality is rampant, and not exclusively relegated to gender. Economic inequality is also drawn along racial and social divides. Countries like Namibia see only a few thousand white landowners owning almost half of the country’s agricultural land for a population of more than 2 million. In fact, land distribution has become an increasingly relevant issue. With man-made climate change, deforestation, and overfishing, the rapid environmental decline might be too late to reverse. Although organizations like the UN have implemented standards, and worked to save forests, oceans, and the atmosphere, it continues to be a serious issue for the international community. The UN Summit’s 17 global goals span from micro to macro, and hope to contribute to solutions for the world’s biggest problems. Through communication, training, and financial support, it is up to influential world leaders and average citizens to seek to improve the world. Since addressing issues like poverty and hunger, most countries have made considerable progress on every set goal.

So we know that the United Nations has been effective working on these issues, but HOW effective has it been? Find out in our video. Thanks for watching TestTube! Don’t forget to like and subscribe so you don’t miss out. We’ll see you next time..

7 CRAZY Recent Breakthroughs in SCIENCE in 2017

For all those celebrity deaths and insane political shenanigans, 2016 actually gave us some pretty weird scientific developments too. From batteries that run on pee through to the world’s first three parent baby, it was a pretty nutso year. But if January’s developments are anything to go by then 2017 is gonna be even weirder, because in the past month we’ve seen a human pig hybrid, a skin printing machine and the potential discovery of a material theorised over a hundred years ago. This is is our list of seven crazy recent scientific breakthroughs. Number 7: Skin on Demand Making your own human skin suit is tough work these days, what with all the DNA to clear up, the funny looks at the dry cleaners, not to mention the kerfuffle in constructing a watertight alibi to fool the Feds. But thanks to a group of Spanish scientists this problem no longer exists, as they’ve developed the world’s first 3D bioprinter capable of producing fully-functional human skin.

This printer was the result of collaboration between the University Carlos the Third de Madrid and the less flamboyantly named BioDan Group who specialise in regenerative medicines. Their material mimics the structure of skin using a layer of collagen-producing fibroblasts, and it’s so close to the real thing it can be used in a wide range of fields, such as testing cosmetics, creating android epidermis, covering human skin loss, and of course the creation of a snappy little waistcoat for daddy. Number 6: Pig Man In the real-life sequel to Babe nobody wanted or asked for, researchers at California’s Salk Institute announced in late January the successful creation of a human-pig hybrid in the laboratory. Now I’m not sure making a creature that’s addicted to eating strips of its own buttocks is something I’d refer to as a success, but that’s because Johnny Cynical over here doesn’t understand the ramifications of this amazing development. The point of creating a human-pig chimera wasn’t to exhibit it in some circus freak-show; it was to provide a potential new source of human organs for transplant. In this experiment, pig embryos were injected with human cells to see if they could survive, and now that we know they can, we think it may eventually be possible to grow human organs inside animals to make up the organ donor shortfall.

Wow, meat, milk, skin and now organs? Thanks animals, you do a lot for us. Those damn vegetables have got a lot of catching up to do, haven’t you Mr Aubergine. Number 5: A Fitting End To Fillings I hate going to the dentist, which is why I’ve pulled out all of my own teeth and now I pay strangers to chew my food for me. But if you still own all your original chompers then a trip to the mouth doctor may soon be a lot less painful, thanks to a strange discovery made just a few weeks back. Researchers at King’s College London found that a drug used to help treat Alzheimers has a nifty little side effect, namely, it can encourage your teeth to repair themselves. Your teeth already do this on their own using dentine, but they don’t produce enough to fill large holes or cracks. However, with a kick up the pants from a drug called Tideglusib an enzyme which prevents dentine formation is turned off, and damage can be repaired naturally within as little as six weeks. I mean, that sounds great and all, but it’s not as much fun as paying a guy down the bus station to spit up food in your mouth like a little baby bird. Number 4: A New Type of Life Ever wonder why the movie Gattaca was called Gattaca? It’s because the letters G, T, A and C are the initials of the four natural bases, Guanine, Thymine, Cytosine and Adenine.

These pair up to form the base pairs of the DNA ladder, and different arrangements of these pairs create different lifeforms when arranged together. Everything from bacteria and baboons through to people and Penelope Cruz – who is not a person, she is a Goddess – everything is based on just four natural bases; until some crazy scientists decided to add two more. On 23rd January 2017, Researchers at The Scripps Research Institute announced the creation of an organism which held two artificial bases within its genetic code, making it the world’s first semi-synthetic organism. Such a development has many possible applications, including the creation of organisms tailored to fight certain diseases. But right now I’m more worried about the title of that movie. Gaxyttaxcy? Xygattyaxca? It’s like they didn’t even think about the ramifications of what they were doing to Ethan Hawke’s finest work? Number 3: An End to Old Age? In another piece of scientific razzle dazzle from the guys and girls at the Scripps Research Institute, we may have just made one of the key discoveries in the fight against cancer and aging.

In Mid-January a protein was identified which is responsible for determining the length of your telomeres, which is important, as this in turn dictates how quickly your cells age and whether they’re likely to mutate into cancer. Telomeres are like your cell’s little clocks, and this protein named TZAP could be seen as some form of battery, determining how long the clock runs for. If we can stretch your telomeres we may be able to delay the aging process, but if they’re unnaturally long they then begin to pose an increased cancer risk. It’s like riding a see saw with whirring blades above and a pit of sex-raptors beneath you – you wanna aim for somewhere in the middle. Thankfully, TZAP naturally prevents your telomeres growing too much by trimming them to keep them nice and short, and a further understanding of how they do this could help us get rid of tumours and wrinkles all at once.

Awesome, those are two of the top three things I hate the most…along with sex-raptors of course. Number 2: Hot Damn Did you know that the Red Hot Chili Peppers can reduce your chances of death? Unfortunately we’re talking about the food and not those delightful LA funk-monkeys, but that’s not gonna stop me using a bazillion song-title puns in this entry. So how does it work? Tell me baby. Well if you listen to me for One Hot Minute I will. Researchers at the Larner College of Medicine in Vermont used data taken from 16,000 Americans over 23 years, and they discovered that those who Dosed their food with spicy chilies enjoyed a 13% reduction in mortality rates from heart disease and stroke. Obviously you Can’t Stop death forever, because passing over to the Otherside is inevitable. But even if you survive a stroke you can be left in a seriously debilitating condition, as each one leaves Scar Tissue on your brain which can trigger seizures, leaving your life’s Fortune Faded. So the knowledge that we can reduce strokes and heart attacks is clearly no Minor Thing.

By The Way, this revelation is old news to some, as historically, many people Around The World already believed that spices contains mystical healing properties. But this is the first time it’s been confirmed scientifically. And do you know who’s excited about this the most? Me and my me and my me and my me and my me and my friends. We love spicy food. Number 1: Metallic hydrogen The existence of a metallic form of hydrogen was first theorised in 1935 by Eugene Wigner and Hillard Bell Huntington, with the knowledge that if the lightest of all elements could be turned into a metal it would prove to be a revolutionary breakthrough for technology. Super-efficient vehicles, improved electricity grids, stupidly fast computers and even space-faring craft are just some of the possible applications for metallic hydrogen, so you can understand why the scientific community collectively soiled itself on January 27th 2017, when one group of Harvard scientists claim they’d managed to create some.

Their experiment used two diamonds to crush liquid hydrogen at a temperature far below freezing point, because the pressure needed to create this substance is greater than you’d find at the centre of the Earth. The metallic hydrogen is still stuck between the two diamonds at the time of writing, as it must be released gradually to see if it can exist in a stable form at room temperature, so it remains to be seen whether this potentially ground-breaking material actually can be used with purpose. And furthermore, some physicists doubt whether the results of this experiment even prove anything at all, saying that further evidence needs to be submitted to give this discovery credence. But I guess we’ll find out soon enough if those naughty boys are telling porky pies or not. So that’s our list, but if you’re after more science-based intrigue of a different flavour, why not check out our recent video on the seven most devastating things mankind could discover, because these are the kind of breakthroughs you better hope we never make in our lifetimes.

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The Greatest Threat to Existence as We Know it

imagine its a beautiful day in April of 2017 three children in different parts of the world are going about their daily lives as they do every day and as their parents have done for countless generations meet Hiro in Japan Hiro wants to be a successful banker one day just like his father but right now he is more interested in spaceships and planets Abasie lives in Kenya with his parents and grandparents one day he wants to travel the world in his own little sailboat akash lives in india with his big happy family when Akash grows up he wants to be the world's greatest chef and so life goes on hiro becomes an astronaut much to his fathers suprise Abasie travels the world in his sailboat and Akash opened his own restaurant in his home town they grow old and pass on having lived fulfilled lifes their children follow and thier children's children until one day in April of 2100 Akoh and his family are crammed with thousands of other people at Haneda Airport hoping it's not too late sadly the people of Tokyo never had a chance the once-proud city is reduced to rubble by tsunami the likes of which has never been seen Anassa lyes in the dark of his quiet home and he knows his time has come it hasn't rained in months all the crops and livestock have died and the well dried up long ago the people of Kenya suffer the slow death of starvation and dehydration oni draws ragged breaths in his hospital bed his body ravaged by disease is the last living member of his family the population of India has fallen drastically these are a few hypothetical scenarios from various parts of the globe while they may seem unrelated they all share a common catalyst climate change as 2017 begins and the United States presidency changes hands it has become increasingly apparent that the new regime is full of climate change deniers and fossil fuel advocates it is more important than ever to spread real information regarding climate change and the catastrophic effects it can produce within the next 100 years let's start with the common misconception when some people hear the term global warming they'll point to an instance of colder than normal weather like the Sahara Desert recently and say that's ridiculous it's snowing here this objection stems from a misunderstanding of how weather differs from climate weather refers to local changes over short periods of time such as minutes hours days or weeks typical examples of whether include rain clouds snow wind and thunderstorms climate refers to longer-term averages and maybe regional or global in scale and can be thought of as weather averaged over an extended period of time typically years or decades an easy way to remember the distinction is weather is what you get climate is what you expect now that we have a good understanding of how climate and weather differ let's look at the scientific consensus over ninety seven percent of actively publishing climate scientists agree that climate warming trends over the past 100 years are extremely likely to have been caused largely by human activity that number goes up to over ninety-nine percent if you include climate scientists who have not recently published scholarly articles most of the leading scientific organizations around the world have issued public statements endorsing this position there are too many to list in this video so i put a link in the description of organizations and their statements climate change deniers tend to latch onto studies that disprove the trend but you always notice that the studies are either not peer-reviewed come from a known anti-science publisher or come from a scientist in a completely unrelated filled with an agenda of their own so where does this problem come from the largest contributing factor to climate change is the burning of fossil fuels oil coal and natural gas all release carbon dioxide into the atmosphere when burned carbon dioxide is considered a greenhouse gas which simply means it sticks around in the upper atmosphere and traps heat the more carbon dioxide is released the more the atmosphere heats up this temperature increase then causes other problems such as melting glaciers and polar ice as arctic ice melts it releases co2 and methane a more potent greenhouse gas compounding the problem by making the atmosphere even warmer the smelting morais it's a vicious cycle ok but where do we stand right now what's the damage as of the end of 2016 carbon dioxide levels are up by nearly 405 parts-per-million the highest in 650,000 years global temperatures up by one point seven degrees since eighteen eighty and nine of the last ten hottest years on record happened since 2000 the tenth being 1998 Arctic ice is shrinking at a rate of 13.

3 percent per decade and land ice is disappearing at a rate of 281 gigatons per year Greenland ice loss doubled between 1996 in 2005 and finally the global sea level has risen seven inches in the last 100 you're probably thinking well that doesn't sound too bad let's look at the consequences by category first the melting of polar ice of course we've all heard that global warming affects the poor polar bears but it's true and it's severe at the current rate of melting which is likely to increase the Arctic is projected to see its first ice-free summer by 2050 imagine that all of the ice gone and yes that likely means extinction for the polar bears within a hundred years and it's not just polar bears some species of ice dependent seals will die off if they can't adapt including harp ringed ribbon and bearded seals then there are the ivory goals and ox ivory goals have already suffered a ninety percent population reduction in Canada over the past 20 years then there's the walrus the arctic fox small plant eaters like ground squirrels hairs lemmings involves large planters like moose caribou reindeer and musk ox and meat eaters like weasels wolverines wolves foxes bears and birds of prey the melting ice is likely to cause a domino effect knocking out species that other species depend upon for food melting ice brings us to our next category rising sea level over the past 100 years the global sea level has risen approximately seven inches the more alarming fact is that the rate of rise in the last decade is nearly double the rate of the entire last century at this rate rising sea level puts coastal cities and islands at great risk SC water reaches further inland it can cause destructive erosion flooding of wetlands contamination of aquifers and agricultural soils and lost habitat for fish birds and plants most projections show the sea level will rise between point 8 and 2 meters by 2100 which would be catastrophic for many low-lying islands and much of the eastern coast of the United States more dire predictions based upon the complete melting of the Greenland ice sheet project a rise up to seven meters that's enough to submerge London the third category is the one with which most people are familiar global temperature rise as CO2 accumulates in our atmosphere the temperature creeps steadily upward the annual increase is measured at roughly 1.

7 degrees Fahrenheit this increase in temperature could cause the most drastic immediate effects of all three categories the list is long and distressing so here we go global warming will cause droughts and heat waves which are already responsible for killing more people per year than floods hurricanes lightning and tornadoes combined it will aggravate the spread of disease warmer weather allows disease bears to be active longer and further abroad warmer ocean temperatures will allow pathogens to flourish as we've already seen with the widespread coral bleaching of the Great Barrier Reef this coral houses twenty-five percent of all marine diversity and the reef is already declined by fifty percent in the last thirty years when the coral goes we'll lose hundreds of thousands of species dependent upon it for shelter which will collapse much of the marine food chain back on land fishing will suffer droughts will destroy crops and livestock and create a water scarcity pushing farmers and people in rural areas into the city this will cause overcrowding and help spark civil wars that killed hundreds of thousands like it did in Syria GDP is expected to plummet by twenty-three percent by 2100 caused by property damage from flooding droughts wildfires storms loss of productivity loss of tourism and illness you can see how quickly the situation can snowball wildly out-of-control it seems very dire but what can we do is it too late to stop the changes we put in motion it's hard to say for sure but the affect humans have had on this earth is severe and the changes have indeed been set in motion even if we stopped emitting greenhouse gases today global warming would continue for at least several more decades since carbon dioxide can linger in the atmosphere for up to centuries some experts believe we're approaching a tipping point a point at which abrupt perhaps irreversible changes would tip our climate into a new state however it may not be too late to limit some of the worst effects of climate change two important steps are required one mitigation the reduction of greenhouse gas emissions into the atmosphere and two adaptation learning to cope with and adapt to the climate changes that have already been set in motion recycling and driving fuel-efficient cars are important steps in the right direction but not sufficient on their own it will take a globally coordinated response such as clean energy agreements between nations as well as local efforts on the city and regional level such as sustainable City Planning public transportation upgrades and energy efficiency improvements so yes climate change is the biggest threat to existence as we know it and is deeply troubling that the United States government seeks to normalize ignorance of good science so if you're concerned for the future of the planet and generations to come do your part help spread this information because the earth truly is worth saving if you enjoyed this video please leave a like or a comment and subscribe to keep up with the latest content thanks for watching and we'll see you in the next video.

The Science of Overpopulation

So I assume you know that there’s a lot of people on this planet. As of last week, Wednesday, I think, was when we turned over to seven — I –, nobody knows. But nobody knows exactly how many people there are, it’s kinda hard to keep track; it’s a big planet. But there are about seven billion people on the Earth right now. And they keep getting born, all the time. In fact, for every 2 people who die, about 4 are born. Every second, there are about four babies introducing themselves to this world, and there are less than two people saying goodbye to it. So, easy math here, our world’s population is growing by about 2.5 people per second. And as a reminder of this, during this video I’m going to have 2.5 ping pong balls being thrown at me every single second throughout the entire rest of the video. Who’s hitting me in the face every single time? [Intro] Ok, instead of the balls, uh, were just gonna do a clock because I get nosebleeds pretty easily, and I don’t want you to have to see that. So 7 billion people, it’s hard to actually get your mind around how many people that is, maybe if you were to just like sit down and count to 7 billion, it would take you like 200 years or something.

On the other hand, there is plenty of space for them. If you took 7 billion people and stood us shoulder to shoulder like we were at a Sting concert, those 7 billion people could fit in an area the size of Los Angeles. We can fit on the Earth. There’s space for us all. So as long as there’s space for us all, what’s the big deal about having 7 billion people? Well it turns out people have been thinking about this for a long time, since around 1800, when the world first clocked 1 billion people. I know what you’re thinking, you’re like 1 billion, that’s nothing, haha. Well at that time all the economies in the world were based on agriculture. How much stuff we could grow with human hands, farm animals, maybe a scythe and a wooden plow or something.

So that kind of technology, a billion people was really pushing it. And the first like big-time thinker guy, to totally have a cow about there just being too many freakin’ people was a British economist named Thomas Malthus. Thomas Malthus calculated that human populations tend to grow exponentially, while the ability of humans to feed each other tends to grow more linearly. And so our growth as a species tends to outstrip our ability to feed everyone. And when that happens, it’s pretty obvious what happens, you get the famine, and the starvation. And for the people who are left over who don’t die of those things, they can get taken care of by disease and war. Basically, Malthus thought that humanities natural state was to be cruel, miserable, pathetic and sniveling in a pile of dirty underpants. In his essay on the principle of population, Malthus observed… “The vices of mankind are active and able ministers of depopulation.

They are the precursors in the great army of destruction, and often finish the dreadful work themselves. But should they fail in this war of extermination, sickly seasons, epidemics, pestilence, and plague advance in terrific array, and sweep off their thousands and tens of thousands. Should their success be still incomplete, gigantic inevitable famine stalks in the rear, and with one mighty blow levels the population with the food of the world.” Diseases also have an easier time taking hold, and of course starvation can kill off a lot of people as well. Though he did make some pretty good points, as long as humanity is well-fed, we’re a pretty nice lot of people. But I have this problem too; when my blood sugar just gets a little bit low, I start killing all of my neighbors — that’s not actually true. When you and your family’s lives are threatened by starvation there’s a lot of things that you will do for food, including go to war. However, what Mister Doom and Gloom didn’t predict was the frickin’ Industrial Revolution- which not only allowed the production of much more food with far fewer laborers, it was also the impetus for this.

Uh, yeah. What that there is, is uh, the population of the Earth busting through Malthus’s ceiling and then his atmosphere and then his ozone layer and then his mesosphere and then his – probably be pretty impressed by this. If you’re not impressed yet, ah, just keep staring at it. I can wait. I got all day. It took humanity fifty thousand years to go from zero to one billion people, and then to get from one billion to seven billion, about two hundred. So wow, Industrial Revolution, thank you for allowing us to grow more food using machines, and for the fast and efficient transportation that it takes to move all that food around to the people who needed it, and thanks for the medical advances too, which help us understand things like the importance of soap and the way that diseases worked, and as a result, humans now live about four decades longer than the average guy in the eighteenth century.

Yeah! Industrial Revolution! So Malthus might have been right about how frickin’ stupid it was to be a human if the Industrial Revolution had not happened. So now, the world’s population is growing at about 1.1 percent per year, which is a tiny bit better than the 1.3 percent per year that got us here. If this current rate continues by 2050, we should have about 9.3 billion people on the planet. So the question is: at what point are these numbers going to outstrip our ability to feed all of the people on the planet? It turns out actually that the question isn’t how many people can the Earth accommodate, it’s more like: how many rich people can the Earth accommodate? Because people in general, they tend to demand stuff for their survival like uh, oxygen, water, and food. But rich people, we have different expectations. We, for example, in America have a lot of agricultural crops, and we have to use a lot of fresh water to water those agricultural crops.

Do you want to take a guess at the number one irrigated crop in the United States of America? Unless you’ve heard this statistic before, you were wrong! It’s grass! It takes more water to create lawns than it does to create all of the corn in America. We’re using it like crazy; though it is a pretty scarce resource, we can use less than one percent of the water on our planet. Most of it is salt water that we cannot use to drink or irrigate crops, and 70 percent of our freshwater is frozen in glaciers. So clean freshwater, non-negotiable and scarce. So what’s next? Ah, food. The world’s combined food output could feed around 11 billion people, and yet, there are 1 billion people who need food. So yeah that’s one of the most pathetic and infuriating things about our planet. So if there’s enough food for 11 billion people, and there’s 7 billion people and a billion of them are hungry, who is eating all of our food? Food, is eating all that food.

A huge amount of the food that we grow in America gets uh, in turn eaten by livestock. It’s so hard to say the truth, which is that, but, rich people can do what they want. Now when I say ‘rich’ it’s important to note that I’m not talking about like, uh, the 99 percent versus the 1 percent rich. I’m talking about if you have running water, electricity that comes into your home, a computer that you can watch youtube videos on, and regularly can afford to eat meat – you are a rich person on the earth, and you, you know sometimes we just have to come to terms with the fact that we – even those of us who don’t have it great in America – have it better off than a whole lot of other people. There’s a lot of people in the world who don’t get that. If you can have a hot shower, that’s like the peak of luxury to me. So assuming that you are a first worlder, that you live in a developed country in Europe, or you live in America or Japan, you consume on average as much stuff as 32 Kenyans.

And now the number of well-off people in the world is starting to increase dramatically and quickly, and this is what we’ve always wanted for the world. So now we have all these moderately well-off people walking around all over the planet, and it’s great! Except that they require more. In the meantime though, a huge percentage of all of the babies that we’re talking about being born right now aren’t being born to these rich people in the developed world. They’re being born in developing nations, and so the population isn’t just growing. It’s growing in this weird, sort of scary, lopsided way. Fact is, people in a lot of developed countries have kinda stopped having babies. Like Japan for example, everybody’s like ‘Japan what are you doing? Why aren’t you having any babies??’ and Japan’s like ‘Uhh don’t know kinda don’t feel like it.’ So on average, Japanese people are having about one baby per household. They’re not even replacing themselves, compared to two or three babies in America or like, five or six in most of Sub-Saharan Africa.

So developing nations are having a baby boom, and that’s what happens when you get, you know, vaccines and antibiotics and safe water and better sanitation. You get fewer babies dying, and we are all completely and totally in favor of fewer babies dying, I hope. But it also means that there are going to be a lot of new Sub-Saharan Africans in the next 50 years or so, and that is where a lot of the 1 billion currently hungry people are already living. So while those of us in the developed world are not having any babies at all and yet consuming enough food for like, four truckloads of babies, the governments in developing countries are struggling with where to put all of these new people and how to feed them all. And you also get what is known as a ‘youth bulge’. A lot of developing nations are currently seeing a huge explosion in people between the ages of 15 and like 29. And all of those youth are out there, looking for the same jobs, all at the same time, feeling generally hormonal as youth do, and being pretty unhappy with their lot in life. Some social scientists conjecture that youth bulges like this have been responsible for nearly every insurrection in history, from the English revolution in 1640 to the more recent Arab Spring.

And neither of those things were bad things, but we should be aware that there may be more of it coming. And another thing that Reverend Malthus never thought of is: what happens when humanity gets together and takes over the whole frickin’ world? Seriously, because it turns out that there are actually supposed to be some other things living on this planet with us. Through our desire for more space and more stuff, we’re putting pressure on pretty much every habitat on earth. So much so that worldwide, 52 species of mammal, amphibian and bird move one category closer to extinction every single year. You know, this world is pretty big, but there’s only so much room and it turns out that Bengal tigers aren’t particularly well-suited to high rise living. So the more there are of us, the fewer of literally everything else there is, except for like, things that we enjoy eating, and petting – dogs and cats as well; their populations continue to grow. So happy birthday new people, welcome to Earth. I’ll try not to screw it up too much for you. If you’re interested in more things to do with global population, please check out the description below.

There will be links in there for our source materials. You can also ask us questions and leave ideas for future episodes of SciShow in the comments and get in touch with us on Facebook and Twitter as well. Goodbye..