There is delusion, and then there is willful fantasy. At what point does the first pass into the second?

Wherever on the anti-science continuum lies the point we might wish to pinpoint, surely global-warming denialists have slid past, riding a toboggan down a slope so steep it threatens to become a cliff. And with the snow rapidly melting, there are many exposed rocks that could bring the ride to a sharp halt.

Unless you live in Seattle, Dublin or Edinburgh, this Northern Hemisphere summer has been difficult to ignore. The United States last month experienced its hottest month in recorded history, breaking the record set in July 1936 at the peak of the Dust Bowl, when farming became nearly impossible in the Great Plains because of heat and drought. As the Dust Bowl years of the mid-1930s still weigh heavily in the U.S. psyche, that is a particularly dramatic record.

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