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To make nitrogen fertilizer you need energy, the source is irrelevant. Phosphorus is mined, again energy source irrelevant.
That being said we have harvest more the enough crops to feed even 10 billion people, we just decide to feed 40 % of our harvest to animals and additionally waste resources for biomass energy and fuel. On top the majority of nations has declinibg birth rates, especially those wasting the most ressources.
Doom by starvation is a global choice not necessity.
I would be very glad to be wrong here!