""He also lists twelve environmental problems facing humankind today. The first eight have historically contributed to the collapse of past societies:
Deforestation and habitat destruction
Soil problems (erosion, salinization, and soil fertility losses)
Water management problems
Overhunting
Overfishing
Effects of introduced species on native species
Overpopulation
Increased per-capita impact of people
Further, he says four new factors may contribute to the weakening and collapse of present and future societies:
Anthropogenic climate change
Buildup of toxins in the environment
Energy shortages
Full human use of the Earth’s photosynthetic capacity."
He does raise interesting points, but he forgot to mention the change of human behavior which conflict's with Nature's order.