Climate change is a result of the greatest market failure the world has seen...We risk damages on a scale larger than the two world wars of the last century.
Failing to curb the impact of climate change could damage the global economy on the scale of the Great Depression or the world wars by spawning environmental devastation that could cost 5 to 20 percent of the world's annual gross domestic product.
What we are talking about is extended world war...People would move on a massive scale. Hundreds of millions, probably billions of people would have to move.
