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I'm not the biggest fan of PETA, but they also espouse grazing animal emissions as a key element of climate change as well, and apparently there is science to back up the claim. Of course, the total climate effect of grazing animals is not just from biological methane emissions, but rather a culmulative effect when one also considers the energy expended to cut down trees, clear away plant and animal wildlife to make the gazing land, as well as the upkeep of the farm.
And of course as many know, much of the Amazon rainforest has been cleared away to make grazing lands for herd animals. Although, most South American deforestation is actually due to the harvesting of trees that are burnt for charcoal in the process of making steel.
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