Mark Steyn
Carl Zimmer summarizes:
In earlier days, Will liked to claim the World Meteorological Organization as an authority when he wrote that there has been no global warming since 1998. Now that the World Meteorological Organization has set things straight, he's claiming a columnist at National Review as his authority. That's quite an upgrade.
Actually, it's worse than "a columnist". His authority is fact averse Creationist Mark Steyn.