Can kangaroo burgers save the world? One Australian scientist thinks so. Farming kangaroos to replace conventional livestock could reduce greenhouse gas emissions, he says. Cattle and sheep expel methane gas—more harmful than carbon dioxide—through belching and flatulence, but 'roos don't, thanks to unique microorganisms in their digestive tracts, reports the BBC. Aussies currently raise some 30 million kangaroos. They taste "excellent—not unlike venison," said the scientist.