Guardian: The latest IPCC climate change report says that averting catastrophe is eminently affordable, reports Damian Carrington. A global roll-out of clean energy would shave only a tiny fraction off economic growth, and bring huge benefits in clean air and energy security. Catastrophic climate change can be averted without sacrificing living standards, according to a landmark UN report published on today. It concludes the transformation required to a world of clean energy and the ditching of dirty fossil...