As reported by Energy & Environment Magazine:
Lord Nicholas Stern, now head of the Grantham Research Institute on Climate Change, said that at this rate global concentrations could reach 5°C, with potentially catastrophic implications.
“Hundreds of millions of people will be forced to leave their homelands because their crops and animals will have died,” he said. “The trouble will come when they try to migrate into new lands, however. That will bring them into armed conflict with people already living there. Nor will it be an occasional occurrence. It could become a permanent feature of life on Earth.”