By Thomas Friedman

In 2006, Ron Suskind published “The One Percent Doctrine,” a book about the U.S. war on terrorists after 9/11. The title was drawn from an assessment by then-Vice President Dick Cheney, who, in the face of concerns that a Pakistani scientist was offering nuclear-weapons expertise to Al Qaeda, reportedly declared: “If there’s a 1% chance that Pakistani scientists are helping Al Qaeda build or develop a nuclear weapon, we have to treat it as a certainty in terms of our response.” Cheney contended that the U.S. had to confront a very new type of threat: a “low-probability, high-impact event.”

Soon after Suskind’s book came out, the legal scholar Cass Sunstein, who then was at the University of Chicago, pointed out that Mr. Cheney seemed to be endorsing the same “precautionary principle” that also animated environmentalists. Sunstein wrote in his blog: “According to the Precautionary Principle, it is appropriate to respond aggressively to low-probability, high-impact events — such as climate change. Indeed, another vice president — Al Gore — can be understood to be arguing for a precautionary principle for climate change (though he believes that the chance of disaster is well over 1 percent).”

Of course, Mr. Cheney would never accept that analogy. Indeed, many of the same people who defend Mr. Cheney’s One Percent Doctrine on nukes tell us not to worry at all about catastrophic global warming, where the odds are, in fact, a lot higher than 1 percent, if we stick to business as usual. That is unfortunate, because Cheney’s instinct is precisely the right framework with which to think about the climate issue — and this whole “climategate” controversy as well.

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