The opening days of the Copenhagen climate-change conference have been rife with denials and—dare we say it?—deniers. American delegate Jonathan Pershing said the emails and files leaked from East Anglia have helped make clear "the robustness of the science." Talk about brazening it out. And Rajendra Pachauri, the head of the U.N.'s Intergovernmental Panel on Climate Change and so ex-officio guardian of the integrity of the science, said the leak proved only that his opponents would stop at nothing to avoid facing the truth of climate change. Uh-huh.

Mr....