He has served on several committees of the National Academy of Sciences including the Committee on Nuclear and Alternative Energy Systems, the Panel on Policy Implications of Greenhouse Warming, the Committee on National Statistics, the Committee on Data and Research on Illegal Drugs, and the Committee on the Implications for Science and Society of Abrupt Climate Change. He recently chaired a Panel of the National Academy of Sciences which produced a report, Nature’s Numbers, that recommended approaches to integrate environmental and other non-market activity into the national economic accounts. More recently, he has directed the Yale Project on Non-Market Accounting, supported by the Glaser Foundation. He is the author of many books, among them Invention, Growth and Welfare, Is Growth Obsolete?, The Efficient Use of Energy Resources, Reforming Federal Regulation, Managing the Global Commons, Warming the World, and (joint with Paul Samuelson) the classic textbook, Economics, whose nineteenth edition was published in 2009. His research has focused on economic growth and natural resources, the economics of climate change, as well as the resource constraints on economic growth. Since the 1970s, he has developed economic approaches to global warming, including the construction of integrated economic and scientific models (the DICE and RICE models) to determine the efficient path for coping with climate change, with the latest vintage, DICE-2007, published in A Question of Balance (Yale University Press, 2008). Professor Nordhaus has also studied wage and price behavior, health economics, augmented national accounting, the political business cycle, productivity, and the “new economy.” His 1996 study of the economic history of lighting back to Babylonian times found that the measurement of long-term economic growth has been significantly underestimated. He returned to Mesopotamian economics with a study, published in 2002 before the war, of the costs of the U.S. war in Iraq, projecting a cost as high as $2 trillion. Recently, he has undertaken the “G-Econ project,” which provides the first comprehensive measures of economic activity at a geophysical scale.