Guardian: I was waiting with bated breath. Last week the Cato Institute — one of the scores of wildly rightwing lobby groups that masquerade as thinktanks in the US — circulated an ad that it intended to place in American newspapers. It was the same old rubbish, debunked a thousand times: We, the undersigned scientists, maintain that the case for alarm regarding climate change is grossly overstated … no net global warming for over a decade .. computer models failing to explain recent climate …