An American environmentalist and writer, is the founder of 350.org, an international climate campaign. This October 24, 350.org is organizing the 350 International Day of Climate Action, with thousands of events planned at iconic places around the world. Bill frequently writes about global warming, alternative energy, and the risks associated with human genetic engineering. Beginning in the summer of 2006, he led the organization of the largest demonstrations against global warming in American history. McKibben is active in the Methodist Church, and his writing sometimes has a spiritual bent.

Bill grew up in suburban Lexington, Massachusetts. He was president of the Harvard Crimson newspaper in college. Immediately after college he joined the New Yorker magazine as a staff writer, and wrote much of the "Talk of the Town" column from 1982 to early 1987.

After moving to the Adirondack Mountains of upstate New York he wrote his first book, The End of Nature (1989, Random House). It is regarded as the first book for a general audience about climate change, and has been printed in more than 20 languages.

His next book, The Age of Missing Information, was published in 1992. It is an account of an experiment: McKibben collected everything that came across the 100 channels of cable tv on the Fairfax, Virginia system (at the time among the nation's largest) for a single day. He spent a year watching the 2,400 hours of videotape, and then compared it to a day spent on the mountaintop near his home.

Subsequent books include Hope, Human and Wild, The Comforting Whirlwind: God, Job, and the Scale of Creation, Maybe One, Long Distance: A Year of Living Strenuously, Enough, and Wandering Home. In March 2007 McKibben published Deep Economy: the Wealth of Communities and the Durable Future. It addresses what the author sees as shortcomings of the growth economy and envisions a transition to more local-scale enterprise. March 2008 saw the publication of The Bill McKibben Reader, a collection of 44 essays written for various publications over the past 25 years.

Bill is a frequent contributor to various magazines including The New York Times, The Atlantic Monthly, Harper's, Orion Magazine, Mother Jones, The New York Review of Books, Granta, Rolling Stone, and Outside. He is also a board member and contributor to Grist Magazine.

Bill has been awarded Guggenheim and Lyndhurst Fellowships, and won the Lannan Prize for nonfiction writing in 2000. Bill currently resides with his wife and daughter in Ripton, Vermont. He is a scholar in residence at Middlebury College.