"The supreme reality of our time is . . . the vulnerability of our planet." When President John F. Kennedy sounded that alarm in 1963, the world couldn't anticipate the gravity of his warning. Today, as we confront the challenges of air pollution, climate changes, over-consumption, and dependence on fossil fuels, we look for guidance and inspiration in the words of great thinkers. This timely volume, printed on postconsumer recycled paper, presents some of the most important statements ever made about the world and its future. Hundreds of thought-provoking quotations on every aspect of green culture offer commentary from scientists, activists, writers, and public figures, including Henry David Thoreau, Kahlil Gibran, Mohandas Gandhi, Theodore Roosevelt, Jimmy Carter, Rachel Carson, Al Gore, and Ansel Adams. Organized by subject, their observations cover conservation, ecology, environmentalism, wilderness, global warming, pollution, nature, and more. These subjects demand everyone's attention, for, in the words if the philosopher and media theoretician Marshall McLuhan, "There are no passengers on Spaceship Earth. We are all crew."