These theories include invasions from various groups of people, a gradual cultural shift as more advanced societies settled in their region, and environmental collapse.

I'd spent the past three years working on books about nuclear war and environmental collapse.

In the near future, the Earth is on the point of environmental collapse, and pollution poisons the atmosphere.

The second, Barbarization, is one in which environmental collapse leads to an overall societal collapse.

All you get from this is desperate hardship due to environmental collapse instead.

Canada wont have any environmental collapse - what a silly exaggeration.

Human population, resource depletion, climate change, environmental collapse, total world debt...

Many of the songs dealt with anger at environmental collapse, but from a cartoonish angle.

The Sound, he said, will not go into a sudden spiral of environmental collapse if the deadlines do not hit exactly where they're supposed to.

The treaty in Durban is not the same as preventing environmental collapse.