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Poop powering hydrogen cars in Hokkaido

Researchers hope manure can do some good for the environment

Cow manure can be a precious source for energy.

TOKYO -- A Japanese publisher once had great success with an exercise book for learning kanji, or Chinese characters, by inserting the word "poop" into every sample sentence. But adults are now finding a more serious use for the pungent substance.

It is estimated that the total amount of excreta produced annually by cows, pigs and chickens in Japan could provide enough energy for a passenger car to travel around the world 750,000 times.

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