Like HowStuffWorks on Facebook!

8 Reasons You Should Stop Drinking Milk Now

Let me repeat: Dairy cows produce lots and lots of waste (and greenhouse gases).

California produces one-fifth of the country's total milk supply. According to, "in the Central Valley of California, the cows produce as much excrement as a city of 21 million people, and even a smallish farm of 200 cows will produce as much nitrogen as in the sewage from a community of 5,000 to 10,000 people, according to a U.S. Senate report on animal waste."