Carbon Dioxide Levels in Atmosphere Reach Terrifying New Milestone Keeling_Curve @Keeling_curve And another first: April 2014 average CO2 value was 401.33, the first monthly average over #400ppm in human history. #globalwarming 11:11 AM - 1 May 2014 [
And another first: April 2014 average CO2 value was 401.33, the first monthly average over #400ppm in human history. #globalwarming
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