William Gail is a meteorologist and past president of the American Meteorological Society. He is the author of Climate Conundrums: What the Climate Debate Reveals About Us, which examines, in part, the objections of some religious groups to climate change science. He is co-founder and chief technology officer of Global Weather Corp. in Boulder, Colo.

California Interfaith Power & Light, the originator of the Interfaith Power & Light movement that began in 2000, works to mobilize faith communities in response to global warming. The organization has affiliates in more than 40 states and is based in San Francisco. Susan Stephenson is executive director.