This is a graphic I put together a few months ago to show how polluting animal agriculture is.    Carbon dioxide's contribution does not look like much till you realize that it stays in the atmosphere for 100 years or more.  Methane, while much more powerful than CO2 cycles out of the air in a decade or so.  The good news is that we can effect rapid change in greenhouse gas emissions by just changing our eating habits...by adopting a healthy, tasty, plant-based way of feeding ourselves we can also slow global warming...how cool is that ?