Without getting into the debate too far, I'll just point out one misrepresentation that the anti-global man-made warming (AGMMW) people rely on. As represented by the cover of the Time machine in 1976 posted earlier, AGMMW people claim that scientists can't get it right: first it was global cooling, not it's global warming. That is a misrepresentation of the facts.
In the mid-70's while most climatologists agreed that man was affecting the climate there was a significant disagreement as to the nature of the effect. Some said that the main effect was caused by particulate pollution, which would result in a significant cooling like a longer term nuclear winter. Others said the main effect was caused by greenhouse gases, which would result in long-term warming. Based on the papers published and the numbers of conference presenters, the scientists who believed that the greenhouse gases were the main contributor outnumbered the particulate pollution proponents at roughly 3-1. But there was a wild card in the deck. Those of you who are older recall Carl Sagan, the god of science in the 70's. He, although not a climatologist, was on the side of the particulate pollution as the main factor group and was very vocal about it. Back then, when any publication like Time wanted quotes on anything science, they went to Sagan. He propounded the global cooling theory to the media and they sucked it up as if that was the only theory. The greenhouse gas proponents got no hearing in mass media, even though they were in the majority by a landslide and more and more scientists were turning to their side yearly. So while the global cooling proponents were in the minority by a wide margin from the beginning, based on fast-food media they appeared to be the only voices out there on global warming in the 70's and into the 80's.
