Peter Schwartz - The Threat of Abrupt Climate Change

It is the threat of "abrupt climate change" that converted him to support new emphasis on nuclear power, Schwartz said. Gradual global warming is clearly now under way, and there is increasing reason to believe that human activity is driving it, mostly through the burning of coal and oil. If warming is all that happens, it will be an enormous problem, but some regions of the Earth would gain (Russia, Canada) while many others would lose.

In the event of abrupt climate change, though, everyone loses. The most likely change would be a sudden (in one decade) shift to a much colder, drier, and windier world. The world's carrying capacity for humans would plummet, driving human population from the current 6.5 billion to as low as 2 billion, with most of the losses from war. It would be a civilization-threatening catastrophe. From research Schwartz has led for the Pentagon as well as from his own training in fluid dynamics, he thinks that continuation of the current warming is very likely to trigger the kind of radical climate instability that has been the norm in Earth's past, except for the last 10,000 years of uncharacteristically stable climate. Therefore everything must be done to head off the shift to climate instability.