Defenders of Wildlife - dedicated to the protection of all native wild animals and plants in their natural communities.

Ducks Unlimited - mission to fulfill the annual life cycle needs of North American water fowl by protecting; enhancing, restoring and managing important wetlands and associated uplands.

Environmental Defense - representing 300,000 members, combines science, economics, and law to find economically sustainable solutions to environmental problems.

Environmental Working Group - a not-for-profit environmental research organization dedicated to improving public health and protecting the environment by reducing pollution in the air, water and food.

Everglades Foundation - Help Save Florida's Everglades.

Friends of the Earth - federation of autonomous environmental organizations from all over the world.

League of Conservation Voters - works to create a Congress more responsive to environmental concerns.

National Association of Conservation Districts - non-governmental, nonprofit organization that represents nearly 3,000 conservation districts across the nation.

National Audubon Society - mission to conserve and restore natural ecosystems, focusing on birds and other wildlife for the benefit of humanity and the earth's biological diversity.

National Endangered Species Act Reform Coalition - lobbying organization composed of rural irrigators, municipalities, farmers and electric utilities dedicated to seeking legislative reform of the Endangered Species Act.

National Wildlife Federation - nation's largest member-supported conservation group. Includes educational resources.

National Wildlife Refuge Association - the only national membership conservation organization devoted solely to the protection, perpetuation and expansion of the National Wildlife Refuge System.

Natural Resources Defense Council - national nonprofit organization dedicated to protecting the world's natural resources and ensuring a safe and healthy environment for all.

Nature Conservancy - works to preserve plants, animals and natural communities that represent the diversity of life on Earth by protecting the lands and waters they need to survive.

Pew Center for Global Climate Change

Sierra Club - a national non-profit public interest organization that promotes conservation of the natural environment by influencing public policy decisions.

Wilderness Society - devoted primarily to public lands protection and management issues.