> But generally the greenhouse gasses emitted by cows are from the organic matter that they were fed.

> Excluding the farm equipment and fossil-fuel-based fertilizer, cow burps form a natural closed loop. Meaning, grow corn or grass and it takes in greenhouse gasses from the soil and the air. Feed it to a cow and it releases those same greenhouse gasses.

Plants take in CO2. Cows fart out methane. Methane is a much more potent greenhouse gas than CO2.

http://www3.epa.gov/climatechange/ghgemissions/gases/ch4.htm...

> Pound for pound, the comparative impact of CH4 on climate change is 25 times greater than CO2 over a 100-year period.