well as long as we are off the rails:
Kangaroos don’t produce methane from digestion, they produced CO2. Researchers are hoping that it has something to do with the bacteria in their guts and introduce them to cattle and sheep to reduce methane production. if that doesn’t work, then there is the genetic engineering solution.
It’s not just gas from animals, it’s also the methane generated from manure, there are manure handling systems that changes the process to end up with CO2 instead of methane