What was the major point learned in the 1991 Biosphere 2 experiment?

Question

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The major lesson learned from the 1991 Biosphere 2 experiment was that humans cannot engineer life-supporting systems as well as nature. The enclosure had issues with maintaining proper oxygen and CO2 levels, nutrient cycling, and controlling insect populations, among other problems. This emphasizes the importance of preserving and protecting natural ecosystems rather than attempting to recreate them artificially.

What Was the Major Point Learned in the 1991 Biosphere