Ppl have so internalized the idea Earth was made for us they don't realize how few tweaks would make Earth an "alien planet"https://twitter.com/alexcruise/status/871087456392667136 …
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The big thing that killed the Biosphere 2 experiment and similar experiments was the O2/CO2 balance
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It's really hard to set up a self-regulating system that matches what the Earth already does
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