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A comment on Show HN: Make continuous reforestation part of your daily workflow. Parent comment

Re:Show HN: Make continuous reforestation part of your daily... by Robotbeat on Sunday March 21, 2021 @10:14AM (#26530607)
900ppm by volume is about 1000micrograms per cubic meter. The density of air at sea level is 1.2 kilograms/m^3.
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