this post was submitted on 25 Mar 2024
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It's not that infinite without a way to refresh protein, such as mining ammonia, eventually you run out of soil resources and crash. It's got a hard limit, so to speak.
And that's why we have been dumping our and our livestock's shit there for thousands of years.
That alone is still not infinite. When you eat food you're taking the nutrients that you need out of it and excreting what is left. So even if all of your shit went directly to manure then you're still putting in less than you took out.
The energy input is the sun, and most of the calories come from the air (carbon dioxide). Given so much external input, harvesting from a plot without reducing soil fertility is totally possible. With nitrogen-fixing crops (soybeans being the poster child), even the nitrogen fertilizer comes from the air.