Denver Zoo Embraces Dung Power for 'World's Greenest Zoo' Status
( 02:50 )
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The Denver Zoo is vying to become the greenest zoo in the world with the installation of a new energy system run entirely on waste. Using a process called gasification, engineers at the zoo have developed a technique they say will convert animal dung and human trash into enough energy to run the zoo's new 10 acre elephant exhibit.

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