The “hydrogenobody” is an organelle inside certain microorganisms that live in a special stomach chamber in cattle, sheep and goats, according to a new study Cattle are a major driver of methane emissions. Thomas Barwick via Getty Images Cows are famous for belching methane, a heat-trapping gas that’s contributing to climate change. A single animal can burp  220 pounds  of the gas in just one year. What’s more, methane is 28 times  more potent than another well-known greenhouse gas, carbon dioxide . Now, scientists may have figured out why cows and other livestock produce so much methane: a previously unknown cell structure hiding in the animals’ gut microbes. The findings, published in the journal  Science  on April 30, could inspire new strategies to reduce methane emissions. Cows, along with some other creatures, like sheep and goats, have a special stomach compartment called the rumen.…