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Re:Guy callendar, the engineer who discovered human-caused g... by realreality on Friday April 19, 2024 @05:38PM (#40092205)
The ~420ppm statistic is considered a global average. The concentration is already quite a bit higher in cities. Poke around here [1] for yourself.

In indoor urban spaces, concentrations are probably already typically 800ppm. It might explain some of our social dysfunction...

[1] https://earth.nullschool.net/#current/chem/surface/level/ove...

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