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And in the early going it certainly won't produce yields anywhere close to those produced on the same land using fossil fuel, fossil water, and fertilizer subsidies.
Also, just because it's efficient when measured by energy:energy in ratio, doesn't mean it can feed 300,000,000 (likely more) people. It will likely be BOTH more efficient AND produce a smaller total yield. That would be a disaster all the same.
And this still ignores the fact that a lot of land will have to be utterly abandoned due to the fact that it can't be farmed sustainably in the first place (not enough water), and climate change will make some areas un-farmable.
300,000,000 is far too high.
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