Quote:The USA still produces a large share of agricultural products, but they compete in a global agricultural market.Are you sure that link is correct? It leads to a page titled "The Environmental Food Crisis - The Environment's Role in Averting Future Food Crises".
It does have a chapter The role of diet change, so I guess that makes it on-topic nevertheless.
"As nearly half of the worldâs cereal production is used to produce animal feed, the dietary proportion of meat has a major influence on global food demand (Keyzer et al., 2005). With meat consumption projected to increase from 37.4 kg/person/year in 2000 to over 52 kg/person/year by 2050 (FAO, 2006), cereal requirements for more intensive meat production may increase substantially to more than 50% of total cereal production (Keyzer et al., 2005)."
Btw, regarding possibilities for efficiency, from the chapter Food from meat we learn that 8% of the world calorie intake requires 1/3 of all arable land to produce animal feed.