Many debates about global warming seem to boil down to appeals to authority, with one side or the other citing some famous scientist, or group of them, to buttress a particular argument. The tone is often, “My expert is better than yours!” Against this backdrop, some analysts have been trying for several years to get a firm handle on where climate researchers come down, as a group, on the central issues in the global-warming debate: Is the earth warming up, and if so, are humans largely responsible? Now comes another entry in this developing literature. William R.L. Anderegg, a doctoral candidate at Stanford University, and his fellow authors compiled a database of 1,372 climate researchers. They then focused on scientists who had published at least 20 papers on climate, as a way to concentrate on those most active in the field. That produced a list of 908 researchers whose work was subjected to close scrutiny.

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