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Originally Posted by sendler
Natural gas for fertilizer (and heat). 70 years. Liquid fuel for farm equipment and transportation to the megacities, and for digging up Phosphorous. 30 years. And Phosphorous. ??? Which could turn out to be the first limiting input. 10 Billion hungry people.
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Definitely Phosphorus. Land, water and energy have a solution.
https://duckduckgo.com/?q=vertical+farming
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