Earth

Environmental Organizations

The Sierra Club. One of the oldest and most active environmental organizations. Membership, $33 per year ($15 for students). Department J-169, P.O. Box 7959, San Francisco, CA 94120-7959.

The Nature Conservancy. Forget the middlemen and politicians. This excellent group actually purchases tracts of rain forest, to preserve them directly. Membership, $15 per year. 1800 North Kent Street, Arlington, VA 22209.

Greenpeace. The famous “Greeners” take on polluters, head-on. Membership, $25 per year. 1436 U Street NW, Box 3720, Washington, D.C. 20C07.

Pro-Space Lobbying Groups

The National Space Society. Membership, $30 per year ($18 for students). 922 Pennsylvania Ave. SE, Washington D.C. 20003.

The Planetary Society. Membership, $25 per year. Pursues projects aimed at exploration. 65 North Catalina Ave., Pasadena, CA 91106.

Human Rights Organization

Amnesty International. Donation — any amount. Fights to free political prisoners of every persuasion. 322 8th Ave., New York, NY 10001.