on February 23, 2012
at 07:47 PM
Yes, grass fed cows produce less methane. It has something to do with their omega-3/6 ratio, so they're even trying to give cows in CAFOs fish oil.
EDIT: After Jay mentioned it's the other way, I did some digging and it seems he's right.
on February 24, 2012
at 09:25 AM
In new zealand where cows are are almost entirely reared on grass there was talk of making farmers buy carbon credits to offset the methane production.