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Geography, 15.07.2020 02:01 Thejollyhellhound20

Of the following greenhouse gases, which have actually decreased in atmospheric concentrations during the past 30 years? A. Hydrofluorocarbons (HFCs)
B. Nitrous oxides (N20)
C. Methane (CH4) and carbon dioxide (CO2)
D. Chlorofluorocarbons (CFCs)

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