Agriculture is a technology (like fire and the wheel) and a system of extracting minerals and nutrients from the soil through photosynthesis. The industrial method of agriculture adds the use of fossil fuels through the Haber-Bosch process for fertilizer, many different chemicals such as herbicides, pesticides, fungicides, and other toxic chemical treatments (including GMO seeds), and of course diesel-powered equipment such as tractors and all the equipment to plow, plant, spray, water, harvest, and transport crops today. The technology of agriculture is what allowed for today’s cities to exist, and it became possible only with the stable climate of the Holocene, which is now disappearing rather quickly. The recent events over the past 6 months in British Columbia, Canada (first the wildfires [especially around Lytton] and now the floods), should be more than enough to convince anyone of this; although plenty of events throughout the rest of the world are also proof.
The one thing which is rarely mentioned about agriculture or the Green Revolution is that it is all entirely unsustainable. Every civilization (which is based upon the bedrock technology of agriculture) which has existed has also collapsed and this current set of living conditions is in the process of collapsing as well, all due to the unsustainable practices upon which civilization is founded. These unsustainable practices eventually lead to overshoot and eventually the landbase surrounding said civilization is unable to support those living upon it. This causes collapse which results in those living there to scatter. Some people may remain in the general vicinity, but a large portion of the population must find new locations for habitat in order to continue to exist.
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