“If you won’t play my way, I’m going to take my ball and go home!” One expects such behavior from 7-year-olds. Not from grownups. But that’s the behavior of 60 scientists, journalists, politicians, activists, and others who signed an open letter published in the (dependably sympathetic) Guardian Sunday saying, “we will no longer debate those who deny that human-caused climate change is real.” Why didn’t they just come right out and say, “Nya-nya-nya-nya-nya!” But they offer some reasons, or at least excuses, for taking their ball and going home. Let’s consider them. “We are no longer willing to lend our...