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Cow vs. Planet
A World Watch Institute report in 2004 blamed gaseous livestock with emitting 16 percent of the word's annual production of methane -- a powerful greenhouse gas often tied squarely to climate change. The United Nations' chief climate expert, Rajendra Pachauri, recently lumped cow flatulence among his list of threats to the planet, and scientists are exploring ways to reduce gas emissions from cattle. ABC News correspondent Nick Watt takes a closer look at confronting the cattle catastrophe.
Ref. ABC Nightline