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To: Sweet Ol who wrote (182370)	1/28/2014 1:08:35 PM
From: pz	Read Replies (1) \| Respond to of 206209

Google says 1.3 billion cows in the world. So 1.3 billion x 500 litres= 650 billion liters per day or 237,250 billion liters per year of methane.

To: Sweet Ol who wrote (182370)	1/28/2014 1:35:45 PM
From: kidl	Read Replies (1) \| Respond to of 206209

science.howstuffworks.com

To: Sweet Ol who wrote (182370)	1/28/2014 2:40:04 PM
From: Biomaven	Read Replies (1) \| Respond to of 206209

Cows produce around 15% of man-made methane emissions. Methane is a much more potent greenhouse gas than CO2, by a factor of around 25. Offsetting this is that it persists in the atmosphere for a much shorter time than CO2 - under 10 years vs around 100 years for CO2. At one point there was worry that persistent global warming would lead to a massive methane release from Arctic permafrost and produce a forward feedback loop that could spell disaster. More recently those concerns have been tempered: sciencemag.org Peter