Methane's longstanding menace as a climate-altering greenhouse gas is closer than ever to being controlled, said New Zealand scientists in June after genome-mapping found the source of flatulence in ruminant animals, and the researchers said they thought they could vaccinate against it. While livestock accounts for only 2 percent of U.S. greenhouse gas, it causes over half of New Zealand's. Unless the vaccination is successful, farmers will face a huge tax on methane by 2012 brought on by the requirements of the Kyoto Protocol.

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