Methane is agriculture’s second-largest greenhouse gas. Wetland rice fields alone account for as much 29 percent of the world’s human-generated methane. In animal farming, much of the methane comes from lagoons of liquefied manure at industrial facilities, which are as nauseating as they sound.
This isn’t a problem at traditional farms. “Before the 1970s, methane emissions from manure were minimal because the majority of livestock farms in the U.S. were small operations where animals deposited manure in pastures and corrals,” the Environmental Protection Agency says. The E.P.A. found that with the rapid rise of factory farms, liquefied manure systems became the norm and methane emissions skyrocketed. You can reduce your methane emissions by seeking out meat from animals raised outdoors on traditional farms.
CRITICS of meat-eating often point out that cattle are prime culprits in methane production. Fortunately, the cause of these methane emissions is understood, and their production can be reduced.
Much of the problem arises when livestock eat poor quality forages, throwing their digestive systems out of balance. Livestock nutrition experts have demonstrated that by making minor improvements in animal diets (like providing nutrient-laden salt licks) they can cut enteric methane by half. Other practices, like adding certain proteins to ruminant diets, can reduce methane production per unit of milk or meat by a factor of six, according to research at Australia’s University of New England. Enteric methane emissions can also be substantially reduced when cattle are regularly rotated onto fresh pastures, researchers at University of Louisiana have confirmed.
However. . .methane might be a bigger issue than originally thought, meaning if we are in a crisis, politicians will have to force Americans to give up meat. Again, from the Times of London:
The effects of a critical greenhouse gas on global warming have been significantly underestimated, according to research suggesting that emissions controls and climate models may need to be revised
Methane’s impact on global temperatures is about a third higher than generally thought because previous estimates have not accounted for its interaction with airborne particles called aerosols, Nasa scientists found.
When this indirect effect of the potent greenhouse gas is included one tonne of methane has about 33 times as much effect on the climate over 100 years as a tonne of carbon dioxide, rather than 25 times as in standard estimates.
Drew Shindell, of the Nasa Goddard Institute for Space Studies in New York, who led the study, said that the findings added to the importance of measures to contain methane emissions, as well as those of carbon dioxide, which will be discussed at the Copenhagen climate summit in December.
How much will polling on “saving the planet” drop once America learns there’s no more meat in our diet?