You can live indefinitely at +30. I would happily live at +30 all the time, but if I had to try that at -30 I would die pretty quickly. The only way people live in -30 environments for any lengthy period of time is by having bubbles with livable temperatures to get inside of, so they're not living in -30.
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"If stupidity got us into this mess, then why can't it get us out?"
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