WMO reports GHG concentrations at highest in 800K years
Green Car Congress
OCTOBER 31, 2017
ppm in 2015 because of a combination of human activities and a strong El Niño event. Since 1990, there has been a 40% increase in total radiative forcing—the warming effect on the climate—by all long-lived greenhouse gases, and a 2.5% ppm in 2015. Globally averaged concentrations of CO 2 reached 403.3
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