this post was submitted on 25 Jun 2023
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There is another important metric: output/energy.
Today in the US we need around 7-10 calories of energy to produce 1 calories of food. It's possible thanks to fossil fuel bit it's not substainable in the long term.
Before 1950 the ratio was around 0.5 calories of energy for 1 calories of food.
Do you have any sources for this?
Here is an article where they discuss about this topic (in french unfortunately): https://resiliencealimentaire.org/lempreinte-energetique-du-systeme-alimentaire/#post-12761-endnote-6
The side of the article is this publication https://sci-hub.st/https://doi.org/10.1016/S0308-521X(02)00027-6