Christy Lundy In July, British tabloid the Daily Mail came out with a screaming headline: "EXCLUSIVE: Video shows Hillary Clinton boarding private jet just hours after launching global-warming push." Clinton's strategy to slash carbon dioxide emissions, the Mail gleefully reported, didn't preclude her from traveling on an aircraft that burns hundreds of gallons of jet fuel every hour. Read more: It's cheaper for airlines to cut emissions than you think. Air travel by environmentalists has long been an easy punching bag for conservative pundits—and private jets like Clinton's probably deserve some sneering.