" The Keeling Curve Courtesy the NASA Earth Observatory. NASA graph by Robert Simmon, based on data provided by the NOAA Climate Monitoring and Diagnostics Laboratory.   If the scientific story of global warming has one great hero, he is James Hansen, and not only because he is the most important climatologist of his era, whose massive computer models were demonstrating by the early 1980s that increased CO2 posed a dire threat. "

― Bill McKibben , The Global Warming Reader: A Century of Writing About Climate Change