There are few things sadder than the “climate denier.” He ignores the data and neglects the latest science. His rhetoric and policy proposals are dangerously disconnected from reality. He can’t recalibrate to take account of the latest evidence because, well, he’s a denier. The new climate deniers are the liberals who, despite their obsession with climate change, have managed to miss the biggest story in climate science, which is that there hasn’t been any global warming for about a decade and a half. “Over the past 15 years air temperatures at the Earth’s surface have been flat while greenhouse-gas emissions...