The American Community Gardening Association publicizes community gardens around the country and provides listserves and other resources for gardeners.

The American Littoral Society is an environmental organization concerned about issues that affect the littoral zone: that area on the beach between low and high tide. The American Littoral Society (ALS) is a national, non-profit, public-interest organization comprised of over 6,000 professional and amateur naturalists with headquarters in Sandy Hook, New Jersey.

The AMC is America's oldest conservation and recreation organization, and promotes the protection, enjoyment, and wise use of the mountains, rivers and trails of the Northeast. Visit their Web site for information about trip planning, guidebooks, and for conservation action alerts.

The mission of the U.S. Environmental Protection Agency is to protect human health and to safeguard the natural environment - air, water, and land - upon which life depends.

The Green Mountain Institute for Environmental Democracy seeks to reinvigorate the essential connections among the public, government, and information necessary for effective improvements in environmental quality. The Institute hosts forums and provides technical assistance to conservation & development decision-makers to help them become more effective.

A project of the International Geosphere-Biosphere Programme, the Land-Ocean Interface in the Coastal Zone focuses on the area of the earth's surface where land, ocean and atmosphere meet and interact. The project's goal is to understand that interaction and learn how best to manage the world's coastal resources into the future.

The National Gardening Association has excellent garden writers as correspondents.

The National Park Service manages and protects national park system for the enjoyment, education, and inspiration of this and future generations. The Park Service cooperates with partners to extend the benefits of natural and cultural resource conservation and outdoor recreation throughout this country and the world.

The National Recreation and Park Association (NRPA) is a national nonprofit organization devoted to advancing park, recreation and conservation efforts that enhance the quality of life for all Americans. The Association works to extend the social, health, cultural and economic benefits of parks and recreation. Through its network of 23,000 recreation and park professionals and civic leaders, NRPA encourages recreation initiatives for youth in high-risk environments, the promotion of healthy lifestyles, and conservation of natural and cultural resources.

NRDC uses law, science, and the support of more than 400,000 members nationwide to protect the planet's wildlife and wild places and to ensure a safe and healthy environment for all living things.

For any organically/environmentally inclined gardeners out there, this site offers a free monthly 'to do' calendar by email, organized by USDA hardiness zone. It tells what you can plant, what to look out for in the garden, etc.

PPS is a non-profit organization that helps communities grow their public spaces into vital community places, with programs, uses and people- friendly settings that highlight local assets, spur rejuvenation, and serve common needs.

The Sierra Club exists to help individuals to explore, enjoy, and protect the wild places of the earth, to practice and promote the responsible use of the earth's ecosystems and resources, and to educate and enlist humanity to protect and restore the quality of the natural and human environments.

The Trust for Public Land is the only national nonprofit working exclusively to protect land for human enjoyment and well-being.