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People born in 1959 are 100 ppm old.
The Nature Conservancy has a calculator that gives you CO₂ levels in the atmosphere on a given year.
That might be useful if you envy people who have "I was born at x ppm" in their bios.
It doesn't work if you were born before 1937 :(
@szescstopni only 356 ppm kids will remember
@szescstopni 70.71 ppm here!