A portion of Sand Cloud Towels' sales help support three environmental organizations, and the company’s popular tagline “save the fishies” is popular with its customers. Photo courtesy of Sand Cloud Towels.

A portion of Sand Cloud Towels' sales help support three environmental organizations, and the company’s popular tagline “save the fishies” is popular with its customers. Photo courtesy of Sand Cloud Towels.

Ever since the success of TOMS shoes — and the rise of "social impact ventures" — startups have been leveraging social and environmental causes to drive sales...

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