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« Call 911-SMOG | Main | Banned pesticide still used in head lice treatment »

So what’s the beef with climate?

May 8, 2007

cows.jpgCarbon is the primary culprit, contributing 70 percent of global greenhouse gases. But let’s not forget that ever-so-sly methane molecule (CH4) that boasts 21 times more global warming potential per ton than carbon, and is responsible for 23 percent of the atmospheric greenhouse effect.

Look no further than your Big Mac or your bowl of Rice Krispies to find some of the major sources of human induced methane pollution.

An average cow emits 6 percent of its energy in the form of methane gas—otherwise known as flatulence. All of the fart jokes in the world won’t change the fact that livestock produce more than a third of global methane emissions. In addition to CH4 pollution, beef production has led to deforestation in Central and South America for agricultural expansion, largely to feed the United States’ meaty appetite. This exacerbates cattle’s warming effects by slashing some of our biggest carbon sinks.

But before you get too excited about your vegan rice burgers, consider this: rice also emits a significant amount of methane, thanks to bacteria that live in waterlogged, anaerobic paddies. The little buggers decompose fertilizer and volatilize CH4.

What’s more is that the US government currently subsidizes many of the industries most responsible for agricultural methane. US rice received $10.5 billion in government subsidies between 1995 and 2005. Three of the primary livestock feed crops—corn, wheat, and soy—also receive massive subsidies.

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