If we do not deal with climate change decisively, “what we’re talking about then is extended world war,” Lord Nicholas Stern, the eminent economist, said. What Lord Nicholas was telling them, was the potential for mass migrations setting off mass conflict. “Somehow we have to explain to people just how worrying that is,” the British economic thinker said.
If negotiators falter, if emissions reductions are not made soon and deep, the severe climate shifts and sea-level rises projected by scientists would be “disastrous.” It would “transform where people can live,” Stern said. “People would move on a massive scale. Hundreds of millions, probably billions of people would have to move if you talk about 4-, 5-, 6-degree increases” Homeland Security Newswire 24 Feb 2009