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The US can already grow more than enough plant-based food "[The] U.S. could feed 800 million people with grain that livestock eat [...] Animal protein production requires more than eight times as much fossil-fuel energy than production of plant protein" https://news.cornell.edu/stories/1997/08/us-could-feed-800-million-people-grain-livestock-eat

We already grow enough food for 10 billion people. "According to the Food and Agriculture Organization of the United Nations (2009a, 2009b) the world produces more than 1 1/2 times enough food to feed everyone on the planet. That’s already enough to feed 10 billion people" https://www.researchgate.net/publication/241746569_We_Already_Grow_Enough_Food_for_10_Billion_People_and_Still_Can%27t_End_Hunger