Jeff Severinghaus is a Professor of Geosciences at the Scripps Institution of Oceanography, University of California, San Diego. His research raises the question of whether the addition of carbon dioxide to the atmosphere through the burning of fossil fuels could also produce a rapid change in climate, rather than a slow, steady rise in temperatures. He has been published over 100 times and has also performed extensive research in Greenland. Carl Yaeckel is the chapter leader at Citizens Climate Lobby, San Diego. Citizens Climate Lobby has proposed a Carbon fee and dividend plan, a national, revenue-neutral carbon fee-and-dividend system that places a predictable, steadily-rising price on carbon and other greenhouse gases, with fees being returned to households as a monthly energy dividend.