> Yet in the 1970s it was global cooling. Myth. In the 1970s no one was quite sure what was coming, a few people raised the possibility of "global cooling" and

> Yet in the 1970s it was global cooling. Myth. In the 1970s no one was quite sure what was coming, a few people raised the possibility of "global cooling" and one or two journalists hyped it up as journalists are wont to do, but in so far as there was a consensus it was that warming was much more likely to be a problem. > eugenics Not, so far as I can tell, a case of the science turning out to be wrong. What happened was that the Nazis were keen on eugenics and most of the world decided that that wasn't the company they wanted to be keeping. It's a change of values, not of scientific understanding. > positive effects of global warming The IPCC impact report, for instance, does talk about positive effects. It talks more about negative effects because most of the projected effects are negative.