Other measurements taken in the period 1930 to 1950 saw variations ranging from 315 ppm to more than 470 ppm. The report about 800,000 years since it was measured at or above 400 ppm is false propaganda.
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Leftists lie? shocked!
They refuse to acknowledge the test results from over 90,000 wet chemical measurements taken in the period 1812-2004.
They mean, of course, smoothed out over some humongous time scale... except whoops, they aren’t treating the present data the same way!