Many of the EWG’s findings are pretty eye-opening — like some revealing facts about beef, which produces twice the emissions of pork, four times as much as chicken, and 13 times that of vegetable protein such as beans, lentils, and tofu. That’s especially alarming since we waste so much meat — ultimately throwing away about 20% of what we produce — meaning that all that carbon was generated for nothing.
The USDA’s related findings about emissions related to milk and cheese came from a study it conducted of a single commercial dairy with 10,000 milk cows in southern Idaho. The facility is home to 20 open-lot pens, two milking parlors, a hospital barn, a maternity barn, a manure solid separator, a 25-acre wastewater storage pond, and a 25-acre compost yard. If you think that kind of operation can produce a lot of noxious discharge, you’re right. The investigators monitored a year’s worth of ammonia, carbon dioxide, methane, and nitrous oxide emissions and found that this one dairy gives off 3,575 pounds of ammonia, 33,092 pounds of methane, and 409 pounds of nitrous oxide per day. Now consider that there are 365 days in a year and tens of thousands of dairy farms in the U.S.