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Cows receive a lot of attention in climate change discussions because one of the greenhouse gases they produce in the rumen is methane. Progress in our understanding of greenhouses gases, however, may provide new perspective on the role methane—and livestock—play in global warming and cooling. There are three greenhouse gases: carbon dioxide (CO2), nitrous oxide (NO2) and methane (CH4). According to the U.S. Environmental Protection Agency, the U.S. dairy industry accounts for approximately 1.4% of total U.S emissions. While some older studies claim agriculture is responsible for a greater percentage of emissions, many have been found to be misleading because of the way they were calculated. Others go beyond the U.S. to look at global agricultural emissions, which represent a much higher percent of total emissions. Why the difference in U.S. and global estimates? For one, the livestock industry in the U.S. is much more efficient than the rest of the world. We need fewer an

Frank mitloehnerUs environmental protection agencyProtection agencyRethinking methane