For more than two decades, the so-called mainstream media have preached the dangers of manmade global warming, insisting American businesses and consumers must make massive economic sacrifices to ward off a global climate catastrophe. Not even last November’s exposure of e-mails from leading scientists on the alarmist side of the debate — showing them conniving to fudge or suppress data, discredit critics and distort the peer review process — has caused journalists to finally take a skeptical approach to radical environmentalists’ doomsaying. A new study from the MRC’s Business & Media Institute documents how ABC, CBS and NBC have been...