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Never say that the gods lack a sense of humor. I bet they're still chuckling on Olympus over the decision to make the first half of 2010 - the year in which all hope of action to limit climate change died - the hottest such stretch on record.

Of course, you can’t infer trends in global temperatures from one year’s experience. But ignoring that fact has long been one of the favorite tricks of climate-change deniers: they point to an unusually warm year in the past, and say “See, the planet has been cooling, not warming, since 1998!” Actually, 2005, not 1998, was the warmest year to date — but the point is that the record-breaking temperatures we’re currently experiencing have made a nonsense argument even more nonsensical; at this point it...