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.
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.
Climate change will affect the basic elements of life for people around the world - access to water, food production, health, and the environment. Hundreds of millions of people could suffer hunger, water shortages and coastal flooding as the world warms.
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