James Hansen is the director of NASA’s Goddard Institute for Space Studies and adjunct professor in the Department of Earth and Environmental Sciences at Columbia University. Since 1988, he has warned about the threats of heat-trapping emissions, including carbon dioxide, that result from burning fossil fuels. A member of the National Academy of Sciences, he received the Heinz Environment Award in 2001 for his climate research. In 2006, was named one of Time magazine’s 100 Most Influential People.