Nicholas Gregory Mankiw was “chairman of the Council of Economic Advisers under President George W. Bush. In 2006, he became an economic adviser to Mitt Romney and continued during Romney’s 2012 presidential bid.” (source: wikipedia)

In an opinion piece in the New York Times, Mankiw , who is Chair of the Economics Department at Harvard University, wrote:

Among economists, the issue is largely a no-brainer. In December 2011, the IGM Forum asked a panel of 41 prominent economists about this statement: “A tax on the carbon content of fuels would be a less expensive way to reduce carbon-dioxide emissions than would a collection of policies such as ‘corporate average fuel economy’ requirements for automobiles.” Ninety percent of the panelists agreed.

Could such an overwhelming consensus of economists be wrong? Well, actually, yes. But in this case, I am confident that the economics profession has it right. The hard part is persuading the public and the politicians.