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13h 22min, dec 31, 1959 y - Charles David Keeling accurately measures CO2 in the Earth's atmosphere and detects an annual rise. The level is 315 ppm. Mean global temperature (five-year average) is 13.9°C.
Added to timeline:
Climate Change
By
Shelby Johnson
17 Feb 2018
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0
431
Date:
13h 22min, dec 31, 1959 y
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~ 64 years ago
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