While we adapt – as mankind has always done – we can do further work, both on the science and the economics. Anybody who reads the science will quickly realise that many key issues are fiercely contested. There is no consensus. But the controversies about the science are puny compared with those about the economics. On this we are being asked to rely on the Stern review, described by William Nordhaus, of Yale University, perhaps the world\’s leading environmental economist, as “completely absurd”.