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Efforts to curb climate change require greater emphasis on livestock
Date:12/20/2013

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One of the most effective ways to cut methane, the researchers wrote, is to reduce global populations of ruminant livestock, especially cattle. Ruminants are estimated to comprise the largest single human-related source of methane. By reflecting the latest estimates of greenhouse gas emissions on the basis of a life-cycle or a "farm to fork" analysis, the researchers observed that greenhouse gas emissions from cattle and sheep production are 19 to 48 times higher (on the basis of pounds of food produced) than they are from producing protein-rich plant foods such as beans, grains, or soy products.

Unlike non-ruminant animals such as pigs and poultry, ruminants produce copious amounts of methane in their digestive systems. Although CO2 is the most abundant greenhouse gas, the international community could achieve a more rapid reduction in the causes of global warming by lowering methane emissions through a reduction in the number of ruminants, the authors said, than by cutting CO2 alone.

The authors also observed that, on a global basis, ruminant livestock production is having a growing impact on the environment:

  • Globally, the number of ruminant livestock has increased by 50 percent in the last 50 years, and there are now about 3.6 billion ruminant livestock on the planet.
  • About a quarter of the Earth's land area is dedicated to grazing, mostly for cattle, sheep and goats.
  • A third of all arable land is used to grow feed crops for livestock.

In addition to reducing direct methane emissions from ruminants, cutting ruminant numbers would deliver a significant reduction in the greenhouse gas emissions associated with the production of feed crops for livestock, they added.

"Reducing demand for ruminant products could help to achieve substantial greenhouse gas reductions in the near-term," said co-author Helmut Haberl of the Institute of Social Ecology in Austria, "but implementation of demand chan
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Contact: Bill Ripple
bill.ripple@oregonstate.edu
541-737-3056
Oregon State University
Source:Eurekalert

Page: 1 2 3

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