Serena and Roger's Carbon Footprints Erased by the U.S. Open

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Serena Williams of the US serves to Vitalia Diatchenko of Russia during their Womens Singles Round 1 match at the 2015 US Open at USTA Billie Jean King National Tennis Center in New York on August 31, 2015.

Photographer: Jewel Samad/AFP via Getty Images

The U.S. Open is cleaning up tennis.

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