This is why I worry about global warming becoming a partisan issue:

… researchers recently plopped 10 Republicans and 10 Democrats into scanners that measure changes in brain-blood oxygenation. Such changes are thought to be linked to increases or decreases in particular areas of brain activity.

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Each of the partisans was repeatedly shown images of President Bush and 2004 Democratic challenger John F. Kerry.

…

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Turns out, rather than turning down their negative feelings … partisans turn up their negative emotional response when they see a photo of the opposing candidate …

In other words, without knowing it themselves, the partisans were jealously guarding against anything that might lower their antagonism. Turning up negative feelings, of course, is a good way to make sure your antagonism stays strong and healthy.