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sep 28, 2016 - Global CO2 levels exceed 400 ppm at the time of year normally associated with minimum levels.[42] A 400 ppm level is believed to be higher than anything experienced in human history.[43]
Added to timeline:
2010s
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Endarterectomist
10 Dec 2019
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1020
Date:
sep 28, 2016
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~ 9 years and 8 months ago
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