Worldwide, livestock accounts for between 14.5 percent and 18 percent of human-induced greenhouse gas emissions. The percentage is lower in the United States in part because our overall greenhouse gas emissions are so much higher than other countries: In the United States we emit 16.5 metric tons per person per year compared to a worldwide average of about five metric tons. Most of America’s emissions come from power plants and transportation, with each accounting for a third of the total.
https://www.nytimes.com/2018/01/25/climate/cows-global-warming.html
Worldwide, livestock accounts for between 14.5 percent and 18 percent of human-induced greenhouse gas emissions. The percentage is lower in the United States in part because our overall greenhouse gas emissions are so much higher than other countries: In the United States we emit 16.5 metric tons per person per year compared to a worldwide average of about five metric tons. Most of America’s emissions come from power plants and transportation, with each accounting for a third of the total.