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In response to #2 and #3: https://xkcd.com/1732/ https://xkcd.com/1732/ Also, yes. Earth has been substantially warmer in the past. Earth's atmosphere also had
by YaxelPerez 8y ago
In response to #2 and #3: https://xkcd.com/1732/ https://xkcd.com/1732/
Also, yes. Earth has been substantially warmer in the past. Earth's atmosphere also had higher oxygen levels in the past[1], but it would be very bad for most life on earth if we suddenly returned to those conditions[2].
1. https://en.m.wikipedia.org/wiki/Geological_history_of_oxygen https://en.m.wikipedia.org/wiki/Geological_history_of_oxygen
2.
https://en.m.wikipedia.org/wiki/Oxygen_toxicity https://en.m.wikipedia.org/wiki/Oxygen_toxicity
- fromthestart 8y ago>Exposures, from minutes to a few hours, to partial pressures of oxygen above 1.6 bars (160 kPa)—about eight times normal atmospheric partial pressure—are usually associated with central nervous system oxygen toxicity You need 8 times current oxygen levels. This is a non issue.