Another attempt by the anti-beef community to get beef off the dinner plate.
Check it out:

A new study on the environmental impact of livestock production in the United States conducted by researchers in physics, plant sciences, and forestry and environmental sciences at Bard College in New York, Weizmann Institute of Science in Israel and Yale, respectively, claims beef production results in far more damage to the environment than other protein sources.

The study, which appears in the latest Proceedings of the National Academy of Sciences (PNAS), attempts to quantify the environmental impact of each calorie consumed of beef, pork, poultry, eggs and dairy, the major animal-based categories in the U.S. diet. Cattle require 28 times more land, 11 times more irrigation water, release five times more greenhouse gases and consume six times more nitrogen than the other livestock categories, the study says.