Meat Equals Global Warming! Global warming is driven by energy consumption, to the extent that the principal energy sources are carbon-rich fuels that, when burned, emit carbon dioxide or other planet-blanketing gases. As noted above, the production and delivery of meat helps drive up the use of such fuels. But livestock also emit global-warming gases directly, as a by- product of digestion. Cattle send a significant amount of methane, a potent global-warming gas, into the air. The environmental group Earth Save recommends a major reduction in the world’s cattle population, which currently numbers about 1.3 billion. One ton of methane, the chief agricultural greenhouse gas, has the global warming potential of 23 tons of carbon dioxide. A dairy cow produces about 75 kilograms of methane a year, equivalent to over 1.5 [metric] tons of carbon dioxide. The cow, of course, is only doing what comes naturally. But people are inclined to forget, it seems, that farming is an industry. We cleared the land, sowed the pasture, bred the stock, and so on. It’s a human business, not a natural one. We’re pretty good at it, which is why atmospheric concentrations of methane increased by 150 percent over the past 250 years, while carbon dioxide concentrations increased by 30 percent. —Pete Hodgson, New Zealand Minister for Energy, Science, and Fisheries There is a strong link between human diet and methane emissions from livestock…. As beef consumption rises or falls, the number of livestock will, in general, also rise or fall, as will the related methane emissions. Latin America has the highest regional emissions per capita, due primarily to large cattle populations in the beefexporting countries (notably Brazil and Argentina). —United Nations Environment Programme, Unit on Climate Change Belching, flatulent livestock emit 16 percent of the world’s annual production of methane, a powerful greenhouse gas. —Brian Halweil and Danielle Nierenberg in State of the World 2004 Fight Global Warming With Your Knife and Fork —Article by Elysa Hammond in Sustainablebusiness Food productivity of farmland, as noted above, is gradually falling behind population growth. When Paul Ehrlich warned three decades ago that “hundreds of millions” of people would starve, he turned out to have overstated the case—for now. (Only tens of millions starved.) The green revolution, an infusion of fertilizers and mass-production techniques, increased crop yields and bought us time. That, combined with more complete utilization of arable land through intensified irrigation and fertilization, enabled us to more or less keep pace with population growth for another generation. A little additional gain—but only a little—may come from genetic engineering. Short of stabilizing population (which will take another halfcentury), only one major option remains: to cut back sharply on meat consumption, because conversion of grazing land to food crops will increase the amount of food produced. (Some argue that grazing can use land that is useless for crops, and in these areas live- stock may continue to have a role, but large areas of arable land are now given to cattle to roam and ruin.) Let’s say we have 20,000 kcal [kilocalories] of corn. Assume that we feed it to cattle (as we do with about 70 percent of the grain produced in the U.S.)…. The cow will produce about 2,000 kcal of usable energy from that 20,000 kcal of corn (assuming 10 percent efficiency; the efficiency is actually somewhat higher than that, but 10 percent is easy to work with and illustrates the point reasonably). That 2,000 kcal of beef would support one person for a day, assuming a 2,000 kcal per day diet, which is common in the U.S. If instead people ate the 20,000 kcal of corn directly, instead of passing it through the cow, we would be able to support more people for that given unit of land being farmed; not necessarily 10 times more, because people are not as efficient as cattle at using corn energy, but considerably more than the one that could be supported if the corn were passed through the cow first! [So], we could support more people on Earth for a given area of land farmed if we ate lower on the food chain—if we ate primary producers instead of eating herbivores (corn instead of beef). Or, we could support the same number of people as at present, but with less land degradation because we wouldn’t need to have so much land in production…. —Patricia Muir, Oregon State University While 56 million acres of U.S. land are producing hay for livestock, only 4 million acres are producing vegetables for human consumption. —U.S. Department of Commerce, Census of Agriculture
Posted on: Fri, 01 Nov 2013 13:53:59 +0000
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