- National Geographic Online@
- Learn about the wonders of nature and the world's cultures with National Geographic Society's magazine, TV channel, photography, and educational campaigns sites.
- Worldwatch Institute
 - Dedicated to fostering the evolution of an environmentally sustainable society. - World Resources Institute (3)
- Conservation International@
- Friends of the Earth United States
- National, nonprofit advocacy organization dedicated to protecting the planet from environmental degradation.
- Center for a New American Dream
- Takoma Park - Offers information and resources to help individuals and institutions consume responsibly for the health and well-being of our families and the planet.
- Conservation Fund, The
- Arlington - Dedicated to land and water conservation.
- National Recycling Coalition (NRC)@
- Alexandria
- Environmental Law Institute (ELI)
- Internationally recognized, independent research and education centre working to advance environmental protection by improving law, policy, and management.
- National Environmental Education & Training Foundation
- Addresses issues such as health, clean water, educational excellence, and global competitiveness through environmental learning.
- Sustainable Energy and Economy Network
- Works in partnership with citizens groups globally on environment and development issues with a particular focus on climate change, energy, gender equity, and economic issues.
- Alaska Rainforest Campaign
- Coalition of national and Alaska conservation groups that works to protect the remaining wildlands of the Tongass and Chugach National Forests from clearcutting and other harmful development.
- U.S. Composting Council
- Bethesda - Works to achieve maximum conservation, composting, and utilization of organic material in an environmentally and economically sustainable matter.
- Charles Darwin Foundation, Inc.
- Falls Church - Dedicated to promoting conservation, education, and scientific research in and on behalf of the Galapagos Islands.
- American Lands
- For forest activists working to stop logging of pristine wildlands and to protect biodiversity on the National Forests and public lands.
- International Society for Ecological Economics
- Solomons - Encourages the integration of economics and ecology into a transdiscipline aimed at developing a sustainable world.
- Antarctica Project, The
- Leads national and international campaigns to protect the biological diversity and pristine wilderness of Antarctica, including its oceans and marine life.
- Solar Electric Light Fund (SELF)
- Nonprofit charitable organization founded to promote, develop, and facilitate solar rural electrification and energy SELF-sufficiency in developing countries. Administers a carbon neutral club so people can offset their person CO2 emissions.
- H. John Heinz III Center for Science, Economics and the Environment (2)
- Global Forest Watch
- Provides information on logging, mining, and other development activities within and around frontier forests as, or before, it happens.
- National Water Resources Association
- Arlington - Advocates Federal policies, legislation and regulations promoting the development, management, protection and beneficial use of water resources.
- Growth Management Institute (GMI)
- Chevy Chase - Goal is to educate and inform the public on responsible land use and related issues including sustainable urban development and redevelopment.
- American Compliance Institute (ACI)
- Alexandria - Not-for-profit, national membership organization which offers education, training and research in corporate compliance issues.
- Environmental Integrity Project
- Nonpartisan, nonprofit organization established in March of 2002 to advocate for more effective enforcement of environmental laws.
- Accokeek Foundation
- Accokeek - Practices and teaches land stewardship and sustainable use of natural resources, and interprets the natural and cultural resources of the Tidewater Potomac.
- Animal Welfare Institute (AWI)
- Alexandria - Nonprofit charitable organization dedicated to reducing cruelty towards animals.
- Oceanwatch
- Arlington - Working to conserve oceans, marine life, and coral reefs through education and grassroots action.
- Environmental Resources Trust (ERT)
- Helps to create markets for environmental resources regionally, nationally, and globally through value-added and environmentally beneficial transactions.
- Bridging the Watershed
- National Park Labs partnership between Potomac area National Parks and schools.
- Environmental Investigation Agency
- Covers wildlife, logging, and pollution issues around the world.
- Central Maryland Heritage League
- Middletown - Dedicated to the permanent preservation of the premier cultural sites and structures in Central Maryland.
- Science & Environmental Policy Project
- Fairfax - A nonprofit, non-partisan public policy institute dedicated to making sound science the basis for environmental policy decisions.
- Pax World Service
- Initiates and supports programs that encourage peacemaking, citizen diplomacy and sustainable development.
- National Capital Dahlia Society
- Falls Church - Promotes growing dahlias with an emphasis upon growers in the metro D.C. area. Includes calendar, member resources, and information on the Mid-Atlantic Trial Garden.
- Carrollton Manor Land Trust
- Adamstown - Working to preserve agricultural land.
- Low Impact Development Center, The
- Rockville - Nonprofit group that develops and provides information on protecting environmental and water resources via site design techniques that replicate pre-existing hydrologic site conditions.
- Catoctin Conservation District
- Loudoun County - Seeking to protect and preserve the rural landscape in the Catoctin Creek scenic river area, through perpetual open space easements and acquisition.
- Clean Fairfax Council
- Fairfax - Educates citizens on litter prevention, litter control, supports the county recycling program, discourages graffiti.
- Fairfax ReLeaf
- Fairfax - Organization of volunteers who plant and preserve trees on public and commons lands in Northern Virginia.
- 20/20 Vision
- Dedicated to protecting the environment and promoting peace through grassroots action.
- African Wildlife Foundation (AWF)
- Works with supporters worldwide and partners in Africa for the long-term well-being of Africa's remarkable wildlife and wild lands.
- Alaska Wilderness League
- Supports legislative and administrative initiatives to protect Alaska's public lands and waters.
- Alliance to Save Energy
- Nonprofit coalition of business, government, environmental, and consumer leaders promoting efficient use of energy.
- Association of Environmental and Resource Economists
- Established as a means of exchanging ideas, stimulating research, and promoting graduate training in resource and environmental economics.
- Camellia Society of the Potomac Valley
- Citizens Coal Council (CCC)
- Nationwide organization aiming to improve the economy and quality of life in communities where coal is mined, including cleaning up old, abandoned mines.
- Coalition to Repair and Reopen Klingle Road
- Provides fact and information.
- Environmental Support Center
- Strengthens grassroots environmental nonprofits with training and organizational assistance, donations of technology, fundraising loans and other services.
- Environmental Working Group
- Providing the public with new, locally relevant information on environmental issues in their own states, home towns, and neighbourhoods.
- Global Environmental Management Initiative
- Providing strategies for business to achieve environmental, health and safety excellence and economic success.
- Land Trust Alliance
- Supports conservation by ensuring that people who work through voluntary land trust organizations have the information, skills, and resources they need to save land.
- Metropolitan Washington Environmental Professionals
- Promotes contacts among interested persons in the Washington, DC metropolitan area. Membership includes scientists, lawyers, activists, regulators, consultants, and others.
- National Association of Conservation Districts
- Provides news and information for and about the nation's local conservation districts.
- National Coalition To Save Our Mall
- Wishes to thank the WWII generation by building a memorial somewhere other than the National Mall.
- National Fish and Wildlife Foundation
- Dedicated to the conservation of natural resources, fish, wildlife, and plants.
- Negative Population Growth (NPG)
- Organization formed to educate the American people about the detrimental effects a large U.S. and world population has on our environment.
- New Columbia Audubon Society
- Pinchot Institute for Conservation
- Committed to leadership in conservation thought, policy, and action with a mission to advance the conservation of natural resources throughout the world.
- Potomac Conservancy
- Dedicated to protecting and preserving the scenic and envirionmental qualities of the freshwater Potomac River.
- Public Employees for Environmental Responsibility (PEER)
- Works with and on behalf of public employees to safeguard the nation's natural resources.
- Resources for the Future
- Nonpartisan organization conducting research on environmental and natural resource issues.
- Save America's Forests
- Has sponsored national legislation to change the U.S. Forest Service charter from timber extraction to forest stewardship.
- Save Klingle Valley
- Includes the history of the Klingle Mansion, events, and more.
- Save the Tiger Fund
- Program of National Fish and Wildlife Foundation, dedicated to the support and conservation of Asian wild tigers.
- Surfrider Foundation - Capitol Chapter
- Nonprofit organization dedicated to protecting the world's waves and beaches.
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