The Green Revolution of fossil fuel powered fertilizer, irrigation and land prep and machinery and processing and transport has more than doubled crop yields in previously underdeveloped areas since 1960. Returning to organic-permaculture style land use from the decline of fossil fuel and Phosphate availability either from depletion or "leave it in the ground" climate action, will result in lesser productivity. It is said that the Green revolution spared 1 Billion (1/3 of the world overpopulation) people from famine in 1970. We now have nearly 8 billion to feed.
.
.
.
https://en.wikipedia.org/wiki/Green_Revolution