Jared Diamond, author of Guns, Germs, and Steel, talks about the collapse of civilization. I’m reading his book and spending most of my evenings catching up history. If you haven’t read his book, you should definitely watch his speech at Caltech. Several people have recommended this to me, but it was originally mentioned by Josh. If you want to learn about Easter Island (one of the main topics of his speech), check out my other post. Notice how Easter Island is completely deforested.