Why Societies Collapse

Jared Diamond, author of Guns, Germs, and Steel and Collapse gives a talk on why societies collapse. Three of his five factors that contribute to collapse are environmental problems, failure to adapt to environmental problems, and climate change. He also includes social problems such as hostile neighbors and collapse of essential trading relationships. I have not read his books but perhaps he gives a more well-rounded view of collapse than Hughes, while still focusing on the environmental issues.