On August 3, 2015, President Barack Obama and U.S. Environmental Protection Agency Administrator Gina McCarthy released the final version of the Clean Power Plan (CPP). The CPP's goal is to reduce emissions of CO2 in the United States by 32 percent in 2030, relative to 2005 emissions. See earlier analysis of the CPP by Harvard faculty members and other Harvard-Project affiliates here and here and reaction to the final version by faculty affiliated with the Harvard Law School Environmental Law Program.

James Stock, a Faculty Fellow of the Harvard Environmental Economics Program—the Harvard Project's parent program—organized a roundtable discussion that took place on January 4, 2015, at the annual meeting of the Allied Social Science Association, held this year in Boston, entitled "The Economics of the EPA's Proposed Regulation of CO2 Emissions from Power Plants." Professor Stock was a member of President Obama's Council of Economic Advisors in 2013–2014, where he worked on the development of this important regulatory proposal. Harvard Environmental Economics Program (HEEP) and Harvard Project Director Robert Stavins participated in the roundtable panel.