Samuel Thernstrom has studied and written about environmental issues for twenty years, with a particular emphasis on global climate change. He served on the White House Council on Environmental Quality prior to joining AEI in 2003. As codirector of the AEI Geoengineering Project, Mr. Thernstrom studies the policy implications of geoengineering, or climate engineering. This groundbreaking field of climate science involves changing features of the earth’s environment to offset the warming effect of greenhouse gases. Mr. Thernstrom’s television and radio appearances include BBC News, ABC News, CNN, Fox News, NPR, and The NewsHour with Jim Lehrer on PBS.