http://www.independent.co.uk/environment/climate-change/lord-stern-on-global-warming-its-even-worse-than-i-thought-1643957.html
"We haven't seen 3C for a few million years, and we don't know what that looks like either."
Lord Stern said new research done in the past two or three years had made it clear there were "severe risks" if global temperature rose by the predicted 4C to 7C by 2100. Agriculture would be destroyed and life would be impossible over much of the planet, the former World Bank chief economist said.
