It's to a large degree the fault of unsustainable farming techniques. Chicken eating worms that eat grass being eaten by humans exhaling CO2 that grass uses to

It's to a large degree the fault of unsustainable farming techniques. Chicken eating worms that eat grass being eaten by humans exhaling CO2 that grass uses to grow is a closed carbon cycle. Beef belching methane changes the equation a bit, but there's research into ways to decrease that.