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10 animals that are bad for the environment

By: Bryan Nelson on April 14, 2010, 1:05 p.m.

Photo: Daniel Schwen/Wiki Commons/GNU

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According to the U.N. Food and Agriculture Organization, cattle farming is responsible for 18 percent of greenhouse gases. Cattle emit a large volume of methane through burping and flatulence. Cattle ranching is also a major source of deforestation around the world, most notably in South America's Amazon rain forest. Driven by the growing food demands of an expanding human population, cattle in many regions of the world are overgrazing, reducing biodiversity of the ecosystem in the process.