It’s a peculiar thing that as the threat of global terrorism reaches a crescendo, so apparently does the threat of global warming—at least that’s what some would have us believe. Tough, national-security language is borrowed from the former and applied to the latter to make the case: "I really consider this a national security issue,” celebrity activist and “An Inconvenient Truth” producer Laurie David said, and hoped the film would serve as a “wake-up call.” “Truth” star Al Gore calls global warming a “planetary emergency” and speaks of a clash between “civilization and the planet.” Likewise, Bill Clinton’s “first worry”...