Comment Re: Stop Pumping up OIL!!! (Score 1) 495
The comment was done as humor, but the cow's diet is a large variable in the equation. Some farmers are feeding their cows a diet that reduces the generation of methane. http://www.nytimes.com/2009/06/05/us/05cows.html?pagewanted=all&_r=0
And yes, it's the belching.
In Australia they have developed an inoculation against some of the most active methanogenic gut bacteria found in sheep. From memory it reduced the sheep's' generation of methane by about 30% and allowed an extra 1.5% to 2% of their feed to go toward actually producing meat.