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Put in this light, the response of quiet climate denialism—not disbelief in the phenomenon, but the choice to bury one’s head in the sand because thinking about it is too unpleasant—is not just untenable but childish.

Walt, while taking pains to underscore that he is “most certainly not defending, excusing, or rationalizing” terrorism, nevertheless declares: “At the same time, to pretend that American and European actions have nothing whatsoever to do with this problem is to bury one’s head in the sand and ignore the obvious.”

To deny the recent successes of the Affordable Care Act is to bury one’s head in the sand.

To deny the validity of the life-style of such a large and increasingly vocal minority group is simply to bury one's head in the sand.