Many people are surprised to learn that one of the causes of global warming is methane released from animals. It’s released when the animals burp or fart (or pass gas as my mother would prefer me to say). Livestock production, especially cow production, is at an all-time high as our demand for meat and dairy increases yearly.
Cows are going to pass gasses; it’s natural. But the not so natural diets many cows are fed that consist of grains from corn and soy can disrupt their digestive systems and cause them to create more gas than if they were grass fed.
The New York Times has a piece about 15 dairy farms in Vermont that are trying to curb this problem. They aren’t taking their cows off grain feed and letting them grass feed; rather, they are adjusting their diets to
include more plants like alfalfa and flaxseed — substances that, unlike corn or soy, mimic the spring grasses that the animals evolved long ago to eat.
The methane output of Mr. Choiniere’s herd had dropped 18 percent. Meanwhile, milk production has held its own.
Cows have digestive bacteria in their stomachs that cause them to belch methane, the second most significant heat-trapping emission associated with global warming after carbon dioxide. Although it is far less common in the atmosphere than carbon dioxide, it has 20 times the heat-trapping ability.