One greenhouse gas that has a biological origin is methane gas. Cows are well known for their methane production. An interesting article on HowStuffWorks.com talks about the methane production in cows. One idea on reducing cows' methane output is to engineer cows to produce less methane. The article also talked about how in 2003 a flatulence tax was proposed in New Zealand to try and account for the methane gas produced by cows. (It was never passed.)
That article was very interesting! For those concerned about the quantities of methane released from cows into the atmosphere, perhaps they should consider promoting vegetarianism as opposed to passing 'flatulence taxes.' The switch from consuming products of a meat-based diet to those of a vegetable and grain based diet might reduce the large amounts of methane released each year into our atmosphere?
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