From the top of the food chain down: Rewilding our world - George Monbiot

View full lesson: http://ed.ted.com/lessons/from-the-top-of-the-food-chain-down-rewilding-our-world-george-monbiot Our planet was once populated by megafauna, big top-of-the-food-chain predators...

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We all know about the dinosaursthat once roamed the planet,but long after they went extinct,great beasts we call the megafaunalived on every continent.In the Americas, ground sloths the size of elephantspulled down trees with their claws.Saber-toothed cats the size of brown bearshunted in packs,but they were no match for short-faced bears,which stood thirteen feet on their hind legs,and are likely to have driven these catsaway from their prey.There were armadillos as big as small cars,an eight foot beaver,and a bird with a 26 foot wingspan.Almost everywhere, the world's megafaunawere driven to extinction, often by human hunters.Some species still survive in parts of Africa and Asia.In other places, you can still see the legacy of these great beasts.Most tre...