The Heartland Institute has launched a billboard campaign in Chicago that compares people who accept climate science to Charles Manson, the Unabomber, and Osama Bin Laden.
The Guardian reports that the ad campaign is being used to promote their Chicago conference later this month, which will include Rep. James Sensenbrenner (R-WI), Czech President Vasclav Klaus and some former NASA astronauts.
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In a press release, the Heartland Institute states: "The people who still believe in man-made global warming are mostly on the radical fringe of society. This is why the most prominent advocates of global warming aren't scientists. They are murderers, tyrants, and madmen."