Non-profit

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Global Green USA

Founded in 1993 by activist and philanthropist Diane Meyer Simon, Global Green is the American Arm of Green Cross International (GCI), which was created by President Mikhail S. Gorbachev to foster a global value shift toward a sustainable and secure future by reconnecting humanity with the environment.
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Arizona Solar Center

About the Arizona Solar Center
The Arizona Solar Center (AZSC) is a place designed to provide some basic understanding of solar energy, especially as it pertains to Arizona.  It is a non-profit organization administered by a Board of Directors, made up of individuals with wide experience and training in solar energy and other renewable energy resources.  Read more >>

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Freecycle Network

The Freecycle Network™ is made up of 4,748 groups with 6,735,000 members across the globe. It's a grassroots and entirely nonprofit movement of people who are giving (& getting) stuff for free in their own towns. It's all about reuse and keeping good stuff out of landfills. Each local group is moderated by a local volunteer (them's good people).