Factory farms pollute the neighbourhood with slurry run-off into nearby waterways and produce noxious gas emissions, contributing to climate change.
Toxic ammonia fumes from factory farm sheds can affect farm workers' health.
Livestock production accounts for 18% of all (human-induced) greenhouse gases.
It takes 100,000 litres of water to produce 1 kilo of beef, but only 500 litres of water to produce 1 kilo of potatoes. Water scarcity is a major global problem.
Since the 1960's approximately 200 millon hectares of tropical forest have been destroyed, mostly for cattle grazing and growing crops for animal feed.
Overgrazing - keeping excessive numbers of grazing animals on the land - is contributing to a rapid increase in global desertification.