That report is actually based on a recent UN survey about bovine and porcine emissions (both from belching and from flatulence), plus the fertilizers needed to raise their feeds, and (on top of those) deforestation due to ranching are causing more global warming than all automobiles combined.
The figure is not really accurate methinks but, yes it seems that livestock flatulence is causing more harm than we initially thought - I will be blogging about that very soon, so please stay tuned.
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