If you actually measure it, then yes.

https://openknowledge.fao.org/server/api/core/bitstreams/492...

"Total GHG emissions from livestock supply chains are estimated at 7.1 gigatonnes CO2 -eq per annum for the 2005 reference period. They repre- sent 14.5 percent of all human-induced emissions using the most recent IPCC estimates for total an- thropogenic emissions (49 gigatonnes CO 2 -eq for the year 2004; IPCC, 2007)"

Surprisingly there are fewer cows than people, but there's still a billion cows, and a billion of anything adds up quickly.

That's not to say that the other things aren't important as well. Gas flaring from refineries is a pure waste that should be drastically curtailed.