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The Walden Woods Project was founded in 1990 to protect land of ecological and historic significance surrounding Walden Pond. At that time nearly half of the Walden Woods' 2,680 acres remained unprotected from development. Two large tracts of land (a total of 43 acres) were under immediate threat as developers sought to construct an office park and a large condominium complex in close proximity to Walden Pond. In January 1991, the Walden Woods Project raised enough money to buy the 25-acre Bear Garden Hill site. A few years later, the Project acquired a second parcel, known as Brister?s Hill. In 1998, the Walden Woods Project opened The Thoreau Institute at Walden Woods containing over 8,000 volumes and 60,000 items of Thoreau-related materials and launched its two trademark teacher education programs, Approaching Walden and Finding Walden.

San Diego Zoo Global is committed to saving species worldwide by uniting our expertise in animal care and conservation science with our dedication to inspiring passion for nature.

Working in partnership with the community to preserve, protect, and enhance the natural resources of the Santa Monica Mountains for the benefit of the environment and for present and future generations through: land acquisition and conservation easements; habitat preservation and restoration; and research and education.

Oceanic Preservation Society (OPS) is a non-profit organization that creates film, photography and media, inspiring people to save the oceans. Founded in 2005 by renowned photographer and avid diver Louie Psihoyos, OPS is headquartered in Boulder, CO, conveniently between two oceans. OPS's first film, The Cove, has won dozens of awards around the world, including the Oscar® for Best Documentary in 2009, and inspired over a million people to action.

To aid in the protection, preservation and restoration of the natural environment of the nation's major rivers and their watersheds.To expand awareness of environmental issues and responsibility encompassing the river.To create a desire and an opportunity for stewardship and responsibility for a cleaner river environment.

The Center for Resilient Cities builds robust and thriving urban communities that are healthy, just, economically viable and environmentally sound. We envision a world of resilient cities filled with clean water, clear air, green landscapes, sustainable and just food systems, and healthy people in economically thriving neighborhoods.

As the official philanthropic and collaborative partner of Grand Canyon National Park, Grand Canyon Conservancy’s mission is to inspire generations of park champions to cherish and support the natural and cultural wonder of Grand Canyon.

We provide knowledge and inspiration, conservation and advocacy, and logistical support for the climbing community.

As the national voice for hikers, American Hiking Society helps preserve and protect the hiking trails and natural areas that hikers cherish and seek for exploration, exercise and education.

Nature Forward (formerly known as the Audubon Naturalist Society) inspires residents of the greater Washington, DC, region to appreciate, understand, and protect their natural environment through outdoor experiences, education, and advocacy.

Friends of Great Smoky Mountains National Park assists the National Park Service in its mission to preserve and protect Great Smoky Mountains National Park by raising funds and public awareness, and providing volunteers for needed projects. Whatever you love about the Smokies, being a Friend helps protect it! With your help, we have raised more than $75 million in support of environmental education, wildlife management, historic preservation, cutting-edge research, trail rehabilitation, and much more in America’s most-visited national park.

To provide collaborative leadership to create and sustain a successful Mill River Park