Cameron, an ardent believer in man-made Climate change (aka global warming) wanted to shoot it out with the climate change deniers. Per Not Evil Just Wrong:
Cameron said he was itching to debate the issue and show skeptical journalists and scientists that they were wrong.When the boneheads polished up their six shooters and brushed off their ten-gallon hats, Cameron had a change of heart. He was last seen leaving Dodge City by the back door of the Climate Change Saloon. His only word in departing was "Mama!"
“I want to call those deniers out into the street at high noon and shoot it out with those boneheads," he said in an interview.
The blog "Not Evil, Just Wrong" has the story.
Hat tip: The Other McCain