We have a lot of land in the US and spatially we can house a lot of of people. However, to sustain a population we need to have approximately 1.2 acres of cropland per person to support a diverse and healthy diet most Americans have grown accustomed to.
According to Dr. David Pimentel of Cornell University America can only support between 100 and 200 million people if we move to sustainable farming and solar energy. However, our current population is over 300 million.
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