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CEDO opened its doors in Puerto Peñasco, Sonora, Mexico in  January 1980.  CEDO applied for and became an official non-profit organization in the U.S. in February, 1988, with an office in Tucson, Arizona.

Hundreds of thousands of visitors and residents have participated with CEDO in Puerto Peñasco via field trips, eco-adventures, environmental contests, research projects, public talks, summer camps and more. CEDO works with local, state and federal authorities, fishers, schools, civic organizations and others to find sustainable ways for local communities to thrive.