Which of the following most closely approximates the change in global long term trend in methane concentrations in the atmosphere between 2017 and 2021? RECENT GLOBAL MONTHLY MEAN CH. 1900 1890 1880 1870 1860 1850 1840 2617 2018 2021 2019 Year 2020 O A. 14-21ppb В. 25-33рpb O C. 37-46ppb O D. 50-57ppb CH, mole fraction (ppb)

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