They explain sustainability and how the earth and the earth's population is forever changing and growing. They also talk about how much (and little) space we take up.
(From the National Geographic Video)
So if everyone today could fit in Los Angeles we have lots of space, right? I think space may not be the issue here. As we know 7 Billion people use a lot of energy. 5% of the world population takes up 23% of the world energy. That's 350 Million people taking up 23%. It takes 1, 521,800,000 Billion people to use 100%, that means 5,478,200,000 people have no energy. So if the world's population is increasing and the energy being used up how long will it take for Earth to fall into an energy crisis? Unless we can find an alternate energy source the earth may not have power much longer.
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