Environmentalist Denis Hayes Organizes Another Earth Day.

Washington Post reporter Michael Grunwald. His new book is The Swamp: The Everglades, Florida, and the Politics of Paradise. The Everglades were once considered a wasteland, worthy of being decimated.

Scientist Barry Commoner, founder and director of the Center for the Biology of Natural Systems in New York. For years Commoner has been at the forefront of the ecology movement. "Time" magazine once dubbed him the "Paul Revere of Ecology." Early on he crusaded about the dangers of nuclear fallout. In 1970 he helped organize the first Earth Day, and a year later published "The Closing Circle," an examination of the affect of technology on the environment.

Writer John McPhee. He's a classic example of a "writer's writer," one whose style is endlessly studied and mimicked, and whose effortlessness in moving between subjects as diverse as Alaskan geology, oranges, and birch-bark canoes is the envy of every freelancer. He's worked at The New Yorker magazine since the late 60s and is one of its most popular contributors.