Bristol Bay Heritage Land Trust
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Buffalo River Foundation
Bridging The Gap
Breathe Utah
Brin de Paille
Bye Bye Plastic Bags
Californians for GE-Free Agriculture
California Wild Heritage Campaign
California Academy of Sciences
Calgary Wildlife Rehabilitation Society (CWRS)
Calaveras Big Trees Association
Carbonfund.org Foundation
Cary Institute of Ecosystem Studies
Center for Ecoliteracy
Center for Justice - Spokane Riverkeeper
Catoctin Land Trust
Center for Rural Empowerment and the Environment (CREE)
Central Park Conservancy Inc.
Central Coast Concerned Mountain Bikers (CCCMB)
Central Indiana Land Trust Incorporated
Central Sierra Environmental Resource Center (CSERC)
Centre de Recherche sur les Mammiferes Marins (CRMM)
Centro Internazionale Crocevia (CIC)
Chain Reaction, of Natural Capitalism Solutions
CESTMed (Centre d'études et de Sauvegarde des Tortues marines en Méditerranée)
Chicago Zoological Society
Children & Nature Network (C&NN)
Chattooga Conservancy
City Sprouts
Citizens Campaign Fund for the Environment
CIDIL (Carrefour pour l'Insertion et le Développement des Initiatives Locales)
Citizens for Smart Growth
Clean Lakes Alliance, Inc.
Clean Energy Economy for the Region, CLEER
ClearWater Conservancy
Clean Water for North Carolina
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