Just watched through one of his talks and I liked something that he said, so I'm gonna quote it.
"The world has been through it many, many times before. And what tends to happen, what happens invariably after each mass extinction is that there is huge amount of space available for new forms of life to suddenly emerge and flourish into it. Just as the extinction led to, made way to us. Without that extinction we would not be here. So the world is fine, we don't have to save to world, the world is big enough to look after itself. What we have to be concerned about is whether or not the world we live in will be capable of sustaining us in it. That's what we need to think about"
He talks about many other interesting things, facts about nature, endangered spices and human interference.
You can look at it here:
http://www.youtube.com/watch?v=_ZG8HBuDjgc
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