23-11-16. 22-2-17. 24-5-17. CO2 (ppm). 1830. 1850. 1870. 1890. 1910. 1930. 1950. 25-11-15. 24-2-16. 25-5-16. 24-8-16. 23-11-16. 22-2-17. 24-5-17. CH4 (ppb).
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