this post was submitted on 13 May 2024
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The industrial farming of corn in the US requires using hybrid corn strains to reach the yields it has, which in turn requires the use of fertilizers because the natural soils is incapable of sustaining the density of corn plants that hybrid varieties achive.
Those fertilizers in turn are mainly made from Oil, which is a non-renewable resource, making the whole thing unsustainable. It's is possible to make the fertilizers sustainably, it's just much more expensive so that's not done.
The US is so deeply involved (including outright military invasions) in the Middle East from where most of the oil comes because in the US oil it's not just a critical resource for Transportation and Energy, it's also a critical resource for Food because it's so incredibly dependent on corn (which is estimated to add up directly and indirectly to more than 70% of the human food chain there)
PS: There is a book called The Omnivore’s Dilemma which is a great read on this.
Fertilizer is not made from oil. Oil/gas is used to power the factory but that doesn't make the farming unsustainable.
Because if you use the criteria of where we get our energy from, home gardening isn't sustainable either because your house is powered by oil/gas.
Fertilizers are made from Amonia which in turn is made using the Haber-Bosch process which requires fossil fuels to provide the necessary energy and as reactants (see this related article).
There is also "natural" fertilizer made from organic mass left over from other activities which would otherwise go to waste, but that's insufficient for large scale intensive farming (composting is fine for your community garden or even for supplementing low intensity agriculture, but not for the intensive industrial farming growing things like hybrid corn).
Finally, the use of techniques like crop rotation which lets letting fields lie fallow so that natural nitrate fixation occurs and the soil recovers do not make the soil rich enough in nitrates to support hybrid corn growing because, as I mentioned, the plant density is too high to be supported by natural soil alone without further addition of fertilizers.
That's exactly what I said! Fertilizer is not made from oil. The factory is powered by oil. Just like your home where you garden is powered by oil.