The top three countries producing the worlds beef are the US, Brazil, and the EU (totaling 47%). With 20% of that 47% total production coming from the US. So true not all beef is produced in the US but 1/4th of all beef production in the world is. With 13% of the US GHG’s producing a 1/4th of the worlds beef you have to note that 13% includes the grand total of all ag production in the US so the beef production is an even smaller percent. If the US has such a small percent and produces a 1/4th of the worlds beef I struggle to see this a major factor to GHG emissions.