United States Environmental Protection Agency (new) Cows produce 150 billion gallons of methane per day. Close. "Key facts and findings. In the 1970s, 140 million head of cattle were needed to meet demand. The most important greenhouse gases from animal agriculture are methane and nitrous oxide. FAO. By the numbers: GHG emissions by livestock". The main agricultural greenhouse gases (GHG) are methane and nitrous oxide. The objectives of this manuscript are to 1) discuss the main greenhouse gas emissions sources from the livestock sector and 2) summarize the best mitigation strategies. Better breeding, genetics and nutrition have increased the efficiency of livestock production in the U.S. Livestock are responsible for 18 per cent of the greenhouse gases that cause global warming, more than cars, planes and all other forms of transport put … United States Environmental Protection Agency. "Overview of Greenhouse Gases". In the 1970s, 140 million head of cattle were needed to meet demand. Impact of Livestock on Climate Change. Cows and other ruminants account for just 4 percent of all greenhouse gases produced in the United States, he said, and beef cattle just 2 percent of direct emissions. Cows produce between 250 and 500 liters of methane every day. Better breeding, genetics and nutrition have increased the efficiency of livestock production in the U.S. [xi] Ross, Phillip. (New) "Inventory of U.S. Greenhouse Gas Emissions and Sinks 1990-2015". Methane is produced in the rumen of the cows by methanogen microbes and are naturally present in all ruminant animals. From burping cows and food miles to greenhouse gases. While the Greenhouse Effect is a natural phenomenon, human activity has increased the levels of some GHG well above historic levels, causing a significant warming trend on a global basis. Cows and other ruminants account for just 4 percent of all greenhouse gases produced in the United States, he said, and beef cattle just 2 percent of direct emissions. The gases involved in this are called the "Greenhouse Gases" (GHG). That’s a lot of gas.