The reason I mention Al's co-religionists at the Hadley Centre is that they have come to realize that computer projections of global warming have been wrong. Carbon dioxide levels have indeed increased, but not temperatures. So bundle up, Al. Last year, in many parts of the world, snowfalls reached levels not seen in decades. The Associated Press recently shrieked that global warming "is a ticking time bomb that President-elect Barack Obama can't avoid," but the facts are otherwise. The computer models that have predicted global warming have failed, just as the computer models that predicted very few financial losses for the insurance industry from credit default swaps failed.
Christopher Booker, writing in the U.K.'s Daily Telegraph, observes, "2008 was the year man-made global warming was disproved." I am not sure I would go that far, but I do believe that the so-called consensus that the catastrophists claim exists among scientists has frayed, and it may be years before we know what causes global warming or whether it is long-range. It may be caused by humans, but it also may be caused by natural activity on the sun.
From the Yale Center for the Study of Globalization has come a very interesting book of essays that display the diverse views of some very serious scientific minds. One contributor, Richard Lindzen, professor of atmospheric sciences at MIT, raises this question: "Is the Global Warming Alarm Founded on Fact?" He acknowledges that over the decades, there has been some global warming but argues that the predictions of catastrophe are greatly exaggerated. "Actual observations suggest that the sensitivity of the real climate is much less than that found in computer models whose sensitivity depends on processes that are clearly misrepresented."