We were in Tucson, Arizona, yesterday. We toured the Biosphere (where scientists were locked in for two years, trying to live in a self-contained world, with some mixed results). It was fascinating.
10/1/2020: Finished year 7 (!), with continuing gratitude towards this amazing community. Based in St. Louis, MO. Regular worker-bee and self-taught photography dilettante....
Very cool. I remember learning as a kid that we were in an ice age and would have to live in something like this by the time we were 40. So glad that didn't happen.