Domesticated livestock, mostly cows and pigs, account for some 60% of the biomass of all land mammals.  Humans make up another 36%.  Wild animals only account for the remaining 4%.  Is it any wonder that human activity impacts the planet?  The carbon footprint of our agriculture is huge.  Livestock drive almost 80% of the use of global agricultural land for grazing and growing feed (for animals, not humans).  Ruminants, such as cattle and sheep, further impact the environment by pollution through fossil fuel use, animal methane, effluent waste, and water needs.  Cutting back on red meat by just a third, and replacing it with pork, poultry or legumes would drop our individual food related emissions by 13% … without even considering the health aspects of such a diet change.