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Scientists have found a new way to use cow farts as bio-energy. According to this project, every cow has a backpack that collects methane gas. They had to insert a pipe into the cow's rectum. When they fart, all the gas stored in the backpack. 

These gases are not only made of methane, but it can be used as bio-energy. Methane is a greenhouse gas and collaborates to increase the global warming. 

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