Link http://www.msnbc.msn.com/id/15391426/site/newsweek/
Remember Global Cooling?
Why scientists find climate change so hard to predict.

WEB EXCLUSIVE
By Jerry Adler
Updated: 5:41 p.m. ET Oct 23, 2006
Oct. 23, 2006 - In April, 1975, in an issue mostly taken up with stories about the collapse of the American-backed government of South Vietnam, NEWSWEEK published a small back-page article about a very different kind of disaster. Citing "ominous signs that the earth's weather patterns have begun to change dramatically," the magazine warned of an impending "drastic decline in food production." Political disruptions stemming from food shortages could affect "just about every nation on earth." Scientists urged governments to consider emergency action to head off the terrible threat of . . . well, if you had been following the climate-change debates at the time, you'd have known that the threat was: global cooling.

More than 30 years later, that little story is still being quoted regularly—as recently as last month on the floor of the Senate by Republican Sen. James Inhofe, chair of the Environment and Public Works Committee and the self-proclaimed scourge of climate alarmists. The article's appeal to Inhofe, of course, is not its prescience, but the fact that it was so spectacularly wrong about the near-term future. Even by the time it appeared, a decades-long trend toward slightly cooler temperatures in the Northern hemisphere had already begun to reverse itself—although that wouldn't be apparent in the data for a few years yet—leading to today's widespread consensus among scientists that the real threat is actually human-caused global warming. In fact, as Inhofe pointed out, for more than 100 years journalists have quoted scientists predicting the destruction of civilization by, in alternation, either runaway heat or a new Ice Age. The implication he draws is that if you're not worried about being trampled by a stampede of woolly mammoths through downtown Chicago, you don't have to believe what the media is saying about global warming, either.

The moral of this story is: "Prediction is very difficult -- especially about the future." - Niels Bohr