This piece compares the reactions - calm, measured economists versus freaked-out climate scientists - between two sets of scholars studying climate change.
The piece argues that climate scientists and economists differ in their beliefs about the adaptability of social and economic institutions to climate change. I think that is correct.
I think there are also likely differences in the process of selection into economics and climate science that feed into these differences in attitudes. A cynic might also argue that the two groups face different elasticities of research funding with respect to predictions of doom.
There is room for some deeper sociology of science in this area.
Oh, and we should have a carbon tax.
Via this Matt Yglesias post.