On March 26 ABC News aired two back-to-back segments on global warming.  One addressed the question: “The vast majority of scientists have determined global warming to be a real threat. So why has it taken so long to convince Americans?”  The story included interviews with Virginia state climatologist Pat Michaels, journalist Ross Gelbspan, and Rick Piltz of Climate Science Watch. The text of the story, “Was Confusion Over Global Warming a Con Job? Some Claim Disinformation Campaign Attempted to Create the Impression Scientists Were Broadly Divided,” was posted on the ABC World News Tonight Web site.