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"A PNAS model showed that even if animals were completely removed from US agriculture, US GHG emissions would be decreased by 2.6% (or 28% of agricultural GHG emissions). The authors state this is because of the need to replace animal manures by fertilizers and to replace also other animal coproducts, and because livestock now use human-inedible food and fiber processing byproducts.[59] This study has been criticized,[60][61][62] and cannot be used to answer