Claim: And their wind and manure emit more than one third of  emissions of another, methane, which warms the world 20 times faster  than carbon dioxide.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: Methane is a strong GHG with a global warming potential 84 times greater than CO2 in a 20-year time frame.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: The methane in biogas is 28 times more potent a greenhouse gas than carbon dioxide.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: Methane is an important greenhouse gas with a global warming potential of 34 compared to CO2 (potential of 1) over a 100-year period, and 72 over a 20-year period.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: Compared to other hydrocarbon fuels, methane produces less carbon dioxide for each unit of heat released.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: While the lifetime of atmospheric methane is relatively short when compared to carbon dioxide, with a half-life of about 7 years, it is more efficient at trapping heat in the atmosphere, so that a given quantity of methane has 84 times the global-warming potential of carbon dioxide over a 20-year period and 28 times over a 100-year period.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: On a 20-year timescale, a mass of methane is about 85 times more powerful than carbon dioxide at warming the Earth, but on a 100-year timescale, it is only about 28-34 times more powerful, because the carbon dioxide continues to warm the earth after the methane is gone.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: The IPCC (Intergovernmental Panel on Climate Change) has estimated that agriculture (including not only livestock, but also food crop, biofuel and other production) accounted for about 10 to 12 percent of global anthropogenic greenhouse gas emissions (expressed as 100-year carbon dioxide equivalents) in 2005 and in 2010.Cows produce some 570 million cubic metres of methane per day, that accounts for from 35 to 40% of the overall methane emissions of the planet.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Methane in the Earth's atmosphere is a strong greenhouse gas with a global warming potential (GWP) 104 times greater than CO2 in a 20-year time frame; methane is not as persistent a gas as CO2 (assuming no change in carbon sequestration rates) and tails off to about GWP of 28 for a 100-year time frame.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Methane is a significantly more potent greenhouse gas than carbon dioxide in the amount of heat it can trap, especially in the short term.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Globally, enteric fermentation (mostly in ruminant livestock) accounts for about 27% of anthropogenic methane emissions, Despite methane's 100-year global warming potential, recently estimated at 28 without and 34 with climate carbon feedbacks, methane emission is currently contributing relatively little to global warming.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Farm animals account for between 20% and 30% of global greenhouse gas emissions.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Since methane gas is twenty-five times stronger (for a given weight, averaged over 100 years) than CO 2 as a greenhouse gas; this would immensely magnify the greenhouse effect.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: There is concern over increases in atmospheric methane in the context of the global carbon cycle, because methane is a greenhouse gas that is 23 times more effective at absorbing long-wave radiation than CO on a 100-year time scale.