Nick Butler is a visiting professor at King's College London and a former senior executive at energy company BP.
A climate-based trade war is now likely if not probable


Smoke rises from a coal-powered steel plant at Hehal village, India, on Sept. 26: in Asia, emissions are set to keep rising until at least 2030. © AP
Nick Butler is a visiting professor at King's College London and a former senior executive at energy company BP.