In July Al Gore ("Can We Save the Planet and Rescue the Economy at the Same Time?") launched his call for 100 percent clean electricity in 10 years with the speech from which this article is adapted.
Nobel Prize-winning economist Joseph E. Stiglitz ("The Seven Deadly Deficits") is the coauthor of The Three Trillion Dollar War. Guy Billout has done illustrations for dozens of publications and many children's books.
Contributing writer Julia Whitty ("Diet for a Warm Planet") lightened her carbon footprint by losing five pounds while writing this story.
Bill McKibben ("The Most Important Number on Earth") is the author of many books, including The End of Nature, the first popular book on climate change.
Fara Warner ("Losing Focus"), a contributing writer for Fast Company, reported on Ford in her Saab.
Photographer Christopher LaMarca ("Unwell") has spent two years chronicling the impact of the natural gas boom on the rural West. Rebecca Clarren writes "The Good Life," Salon's sustainability column.
Mark Schapiro ("Let's Go Europe") is the editorial director of the Center for Investigative Reporting and author of Exposed: The Toxic Chemistry of Everyday Products and What's at Stake for American Power.
Katharine Mieszkowski ("Big Green Brother") is a senior writer at Salon.
David Roberts ("The Truth About Green Jobs") is a staff writer at Grist.org.
Photographer Andrew Hetherington ("After Math") blogs about visual art at whatsthejackanory.com. Robin Mejia has written for Science and Wired.
Chris Lehmann ("What About the Dirty Jobs?") is a senior editor at Congressional Quarterly.
Sasha Abramsky ("10 Ways to Steal an Election") is the author of a Ford Foundation report on the nation's voting infrastructure due out this fall.
A senior editor at Slate, Michael Agger ("On Walden Books") has yet to write a book on self-sacrifice.