The preponderance of scientific evidence makes clear that the earth is warming as a result of human activity. Now policy makers are faced with the question of what to do about it. Scientific American spoke with three leading economic policy thinkers on the topic of how cutting emissions of greenhouse gases would affect the global economy. Links to the edited interviews follow below.

  • Sir Nicholas Stern


    Sir Nicholas Stern is an economist and professor of economics and government at the London School of Economics and Political Science. Former chief economist for the World Bank, he prepared the Stern Review on the Economics of Climate Change for the British government in 2006.

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    COURTESY OF NICHOLAS STERN

  • Bjorn Lomborg


    Bjorn Lomborg is a political scientist and adjunct professor at the Copenhagen Business School in Denmark. His latest book is entitled Cool It: The Skeptical Environmentalist's Guide to Global Warming.

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    COURTESY OF BJORN LOMBORG

  • Gary Yohe


    Gary Yohe is an economist at Wesleyan University in Middletown, Conn. and a lead author for the Intergovernmental Panel on Climate Change (IPCC), which shared this year's Nobel Peace Prize with former U.S. vice president, Al Gore.

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    COURTESY OF WESLEYAN UNIVERSITY