Events & Calendars "Countdown: Our Last Best Hope for a Future"

Alan Weisman, best-selling author of "The World Without Us," will speak on his new book, "Countdown: Our Last Best Hope for a Future."

Weisman is a senior editor and producer for Homelands Productions. He has reported from the U.S., Mexico, Canada, Central and South America, the Caribbean, Antarctica, Europe, the former Soviet Union and the Middle and Far East. His radio pieces have been heard on NPR, Public Radio International and American Public Media. His writing has appeared in Harper's, The New York Times Magazine, The Atlantic Monthly, Vanity Fair, Los Angeles Times Magazine, Orion, Audubon, Mother Jones, Discover, Condé Nast Traveler, Resurgence and several anthologies (including "The Best American Science Writing 2006" and "Moral Ground").