Co2 is important but water is also a pressing issue:Today it takes 441 gallons of water to produce one pound of boneless beef[0]. There are a lot of numbers for this on the the web,and this may not include water for feed and processing/packaging but its a lot of water,when for example, lake Mead is about to become a deadpool. [0]http://meatmythcrushers.com/myths/myth-it-takes-2400-gallons...