He said the white paper "seems to rely on a very selective review of literature, thereby leading to likely bias."
The new tailpipe regulations are expected to cut emissions from the nation's cars and light trucks 21 percent by 2030. Environmentalists praised the move as a major victory in the effort to address global warming.
Michael Livermore, an economist with New York University, said the government's social cost of carbon analysis is not perfect. He would like to see a higher price per ton, and more consideration given to potential catastrophic risk.
Still, government economists are considering those things, he said.
"I don't think this is the end of the road in terms of analysis," Livermore said. "They've made a lot of progress. They're tackling lots of the underlining questions."
Reprinted from Climatewire with permission from Environment & Energy Publishing, LLC. www.eenews.net, 202-628-6500