#60;b#62;David Archer#60;/b#62; is a professor in the Department of the Geophysical Sciences at the University of Chicago, publishing on Earth#8242;s carbon cycle and its interaction with global climate. Dr. Archer has written a series of outreach books on climate change, including #60;i#62;Global Warming: Understanding the Forecast, a text for non-science major undergraduates; The Long Thaw: How Humans are Changing the Next 100,000 Years of Earth#8242;s Climate; and The Global Carbon Cycle, a primer in climate science#60;/i#62;. He teaches classes on global warming, environmental chemistry, and global biogeochemical cycles, and is regular contributor to the climate science blog site… realclimate.org.#60;p#62;#60;b#62;Ray Pierrehumbert#60;/b#62; is the Louis Block Professor of the Geophysical Sciences at the University of Chicago, interested in the physics of climate, especially regarding the long term evolution of the climates of solar system and extrasolar planets, and author of "Principles of Planetary Climate", Cambridge University Press 2010.