A: Farmers can’t plant much more land, because almost every accessible acre of arable soil is already in use. Nor can the use of fertilizer be increased; it is already being overused everywhere except some parts of Africa, and the runoff is polluting rivers, lakes, and oceans. Irrigation, too, cannot be greatly expanded—most land that can be irrigated already is. In so far as beef currently requires 20 times more land and emits 20 times more GHG emissions per gram of edible protein than common plant proteins, such as beans, perhaps we need to shift our crops for livestock feed to plant proteins. More at WRI
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