Peak phosphate

https://en.wikipedia.org/wiki/Peak_phosphorus

https://web.mit.edu/12.000/www/m2016/finalwebsite/solutions/phosphorus.html At current consumption levels, we will run out of known phosphorus reserves in around 80 years, but consumption will not stay at current levels. Nearly 90% of phosphorus is used in the global food supply chain, most of it in crop fertilizers.

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Greenhouse