On November 5, the House Committee on Science and Technology held the first congressional hearing devoted to geoengineering, a strategy to change features of the Earth's environment to offset the warming effects of greenhouse gases. The AEI Geoengineering Project has been active for over a year, and Lee Lane, codirector of the project with Samuel Thernstrom, was one of the witnesses asked to testify on Capitol Hill. Lane recently coauthored an extensive analysis of geoengineering options for the Copenhagen Consensus that has been cited in the New York Times, in the Financial Times, and on Time.com. A growing number of climate scientists and economists are supporting research into geoengineering, and the idea is gaining popular notice as well. In their new book SuperFreakonomics (William Morrow, 2009), University of Chicago economist Steven Levitt and his coauthor Stephen Dubner discuss geoengineering's potential.