Jokes about cows passing gas abound but are based on truth, and rice paddies account for 20 percent of methane emissions.
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Methane is released into the atmosphere from bovine flatulence, rice paddies, and bacteria in bogs.
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The origin of this symbol can be found in the Chinese rice paddies where farmers used a well-known eco-system of fish to fertilize the rice crop and during the winter months provide a valuable food source for the farmers.