What can you do with cow dung? We can think of at least one green car option: transform it into biomethane and use the gas to power a golf cart. This is what the engineers at Yamaha in Katori, in Chiba Prefecture. Osaka Gas Co. provided the methane at a low cost. It was then stored in a special tank filled with activated carbon capable of absorbing the methane at relatively low pressure. The tank was developed by Osaka Gas Co. as an alternative to a high-pressure pump and tank. The town of Katori hosts the so-called "Biomass Town," where the use of cow dung is promoted as a locally produced, low-cost biofuel.
[Source: Japan for Sustainability]

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