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Actually, there is an economic value to being concerned about cow belches and cow farts. Methane is a very high energy gas that cows release into the atmosphere (with the emphasis being on “high energy”). This energy has to come from somewhere. It comes from the cow feed, which is another way of saying that it comes out of your wallet. This feed-dollar-energy is wasted because the cow has an inefficient digestive system. The kangaroo has a diet similar to the cow, but produces far less methane. This is because the kangaroo has an additional bacteria in its gut, which allows the feed to be digested into biologically usable fuel, rather than just waste methane. Efforts are currently underway to transplant this particular bacteria from kangaroos to cows, which will result in the savings of millions of feed dollars (and will help with global warming at the same time).