If the cows hadn’t eaten the grass or grain, it would have been ingested by bacteria any way producing the same amount of Methane.....so I’m not sure of their math or their methodology. What about large whales eating sea plankton....or vegetation rotting away in the swamps and jungles of the world.....did they count humans...there’s more of us than cows. How about deer, elk, wild sheep, water bullalo. I think these kooks are full of the methane they complain about...they can blow it out their behinds and light a match to it! Their science certainly stinks!
Like my daddy always said, there are three types of lies: Lies, Damn Lies, and Statistics. You can make up some great statistics based on nothing.