The US leads the world in meat production. One-third of all land in the continental US is used to grow feed and provide pasture for animals that will be killed for meat, according to the environmental group Mighty Earth. Now that agricultural pollution’s impact on drinking water is coming into focus, meat producers such as Tyson Foods are under pressure to set standards that would require large farms in their supply chains to clean up their acts.

http://www.truth-out.org/news/item/42326-americans-appetite-for-cheap-meat-linked-to-widespread-drinking-water-contamination