I thought methane was the problem, not carbon dioxide. Do they poop less? Did they change their feed?

BTW McDs doesn’t buy American beef because American beef excceeds their standard of fat to lean ratio. They buy from Australia and other countries where the cattle are range fed.

There is this, although it’s over 9 years old. I’ll see if I can find something more recent.
The big question is, how could they possible do it? Unless they genetically breed cows with some sort of non-cow digestive tract.

“BTW McDs doesn’t buy American beef because American beef excceeds their standard of fat to lean ratio”.

Double boeuf with that?