On the BBC program HARDtalk, reporter Stephen Sackur, in a combative interview with Gerd Leipold, retiring Executive Director of Greenpeace, accused Greenpeace of peddling exaggeration and alarmism about global warming. I think that’s true, but Sackur, however unwittingly, built his case on false evidence ... Anyone who actually reads the press release, especially in conjunction with the NASA study to which it is linked, can see immediately that the warning of ice-free summers ”as early as 2030? soley concerns floating polar sea ice, not Greenland ice. I don’t usually defend Greenpeace and don’t plan to make a habit of it. My point is not that Greenpeace is a reliable source but that [climate] skeptics must exercise due diligence. If something looks too good to be true (in this case, a confession of fraud by a political adversary), it probably is.