[mandaladon]

Since nobody is going to re-engineer the ruminant digestive tract anytime soon, the solutions are limited: stop eating meat or at least eat other kinds. (A 2010 study from the Science and Environment section of the Library of the U.K.'s House of Commons reported that a pair of Australian biologists have recommended eating marsupials instead of livestock, since kangaroos and their kin produce almost no methane when they digest.) But there's one more answer too: reformulate the diet of the animals themselves. If you change what goes in, you should be able to change what comes out....libs will soon propose a tax on cow fart emissions or something similarly insane.

[Daveinyork]

So, we all stop eating meat, and so that we can get all the protein we need, we start eating beans and rice. Then, instead of livestock creating greenhouse gases.......