American Wind Energy Association: Promotes wind energy as a clean source of electricity for consumers around the world.

Beyond Pesticides: Works to protect public health and the environment to lead the transition to a world free of toxic pesticides.

Campaign Earth: Mission is to bring people to a new level of personal involvement in critical environmental issues, like global warming.

Conservation International: Applies innovations in science, economics, policy and community participation to protect the Earth's richest regions of plant and animal diversity

Co-op America: Mission is to harness economic power -- the strength of consumers,investors, businesses and the marketplace -- to create a socially just and environmentally sustainable society.

CorpWatch: Investigates and exposes corporate violations of human rights, environmental crimes, fraud and corruption around the world.

Earth Force: Engages young people as active citizens to improve the environment and their communities now and in the future.

Earth911: To empower the public with community-specific resources that improve their quality of life.

ENERGY STAR: A joint program of the U.S. Environmental Protection Agency and the U.S. Department of Energy helps consumers save money and protect the environment through energy efficient products and practices.

EnviroLink Network: A grassroots online community that unites hundreds of organizations and volunteers around the world. Dedicated to providing comprehensive,up-to-date environmental information and news.

Environment Web Directory: The largest exclusively environmental organization directory on the Web includes sites from more than 100 countries.

Environmental Defense: Dedicated to protecting the environmental rights of all people, including the right to clean air, clean water, healthy food and flourishing ecosystems.

Environmental News Network: Provides a global perspective on environmental issues and promotes thought, discussion and awareness.

Environmental Protection Agency: Mission of the U.S. government agency is to protect human health and the environment.

Environmental Working Group: Environmental investigations have been our specialty at the Environmental Working Group since 1993.

Friends of the Earth: Defends the environment and champions a healthy and just world.

Global Response: Organizes international letter campaigns to help communities prevent many kinds of environmental destruction.

Green Living Tips: A journey of discovery in learning about living a more environmentally friendly life.

Green Matters: Simple answers and guidance for going green.

Greenpeace: An international organization with offices in more than 30 countries.

Kids FACE (Kids for a clean environment): Provides information on environmental issues to children.

Low Impact Living: Helps you lower the environmental impact of your home and your daily life.

Natural Resources Defense Council: Uses law, science and the support of 1.2 million members and online activists to protect the planet's wildlife and wild places and to ensure a safe and healthy environment for all living things.

Nature Conservancy: Works around the world to protect ecologically important lands and waters.

National Environmental Trust: A non-profit, non-partisan organization established in 1994 to inform citizens about environmental problems and how they affect health and quality of life.

National Parks Conservation Association: Mission is to protect and enhance America's National Parks for present and future generations.

National Wildlife Federation: Inspires Americans to protect wildlife for our children's future.

New American Dream: Helps Americans consume responsibly to protect the environment, enhance quality of life, and promote social justice.

Public Citizen: A national, nonprofit consumer advocacy organization founded in 1971 to represent consumer interests in Congress, the executive branch and the courts.

Rainforest Alliance: Works to conserve biodiversity and ensure sustainable livelihoods by transforming land-use practices, business practices and consumer behavior.

Sierra Club: America's oldest and largest grassroots environmental organization.

Sierra Student Coalition: A network of high school and college students working to protect the environment.

TreeHugger: Media outlet is dedicated to driving sustainability mainstream.

U.S. Green Building Council: A coalition from the building industry working to promote buildings that are environmentally responsible, profitable and healthy places to live and work.

Wilderness Society: Protecting America's wilderness since 1935 through the combination of science, advocacy and education.

World Resources Institute: An environmental think tank that goes beyond research to find practical ways to protect the earth and improve people's lives.

World Wildlife Fund: Works in 100 countries and is supported by 1.2 million members in the United States and close to 5 million globally

Worldwatch Institute: Work revolves around the transition to an environmentally sustainable and socially just society -- and how to achieve it.