GLOBAL ANNUAL MEAN VALUES OF CO2, CH4, N20 USED FOR climateforcingtable1800 year CO2(ppm) CH4(ppb) N2O(ppb) 2021 414.69 1895.32 334.31 2020 412.42 1878.93 333.03 2019 410.05 1866.59 331.88 2018 407.59 1857.31 330.90 2017 405.19 1849.67 329.74 2016 403.03 1843.12 328.95 2015 399.62 1834.25 328.17 2014 397.32 1822.61 327.08 2013 395.37 1813.40 325.94 2012 392.63 1808.03 325.05 2011 390.62 1803.11 324.21 2010 388.73 1798.89 323.19 2009 386.48 1793.54 322.27 2008 385.00 1787.00 321.50 2007 382.88 1781.39 320.44 2006 381.13 1774.93 319.82 2005 378.96 1774.14 318.91 2004 376.93 1777.03 318.26 2003 375.13 1777.31 317.63 2002 372.56 1772.69 316.94 2001 370.55 1771.24 316.36 2000 368.95 1773.37 315.73 1999 367.78 1772.39 315.01 1998 365.67 1765.54 314.31 1997 363.02 1754.54 313.61 1996 361.92 1751.46 312.93 1995 360.15 1748.80 312.25 1994 358.31 1742.06 311.58 1993 356.82 1736.49 310.93 1992 356.08 1735.51 310.28 1991 355.38 1724.84 309.64 1990 354.04 1714.42 309.03 1989 352.77 1704.54 308.45 1988 351.13 1693.19 307.87 1987 348.66 1682.71 307.30 1986 346.96 1670.08 306.74 1985 345.52 1657.28 306.18 1984 344.06 1644.69 305.62 1983 342.51 1626.47 305.04 1982 340.85 1608.80 304.49 1981 340.10 1591.24 303.96 1980 338.89 1573.79 303.44 1979 336.84 1556.44 302.89 1978 336.81 1539.21 302.29 1977 335.17 1522.10 301.67 1976 333.52 1505.10 301.01 1975 331.85 1488.23 300.31 1974 330.14 1471.49 299.52 1973 328.35 1454.79 298.68 1972 326.71 1437.82 297.85 1971 325.43 1420.76 297.05 1970 324.58 1403.92 296.13 1969 324.22 1387.60 295.40 1968 323.74 1372.09 294.71 1967 322.79 1357.90 294.09 1966 321.58 1346.09 293.61 1965 320.39 1335.93 293.37 1964 319.42 1326.43 293.30 1963 318.61 1316.61 293.30 1962 317.90 1305.47 293.25 1961 317.23 1292.03 293.24 1960 316.57 1275.29 293.16 1959 315.87 1255.38 293.15 1958 315.29 1238.28 293.02 1957 314.93 1225.10 292.65 1956 314.64 1214.93 292.00 1955 314.07 1203.10 290.83 1954 313.13 1193.44 289.70 1953 312.28 1187.57 289.10 1952 312.09 1179.95 288.81 1951 312.09 1170.95 288.68 1950 312.02 1161.90 288.62 1949 311.64 1153.02 288.61 1948 310.88 1146.35 288.61 1947 310.66 1138.18 288.49 1946 310.94 1133.36 288.39 1945 311.04 1130.69 288.37 1944 310.98 1125.24 288.58 1943 310.46 1125.11 288.93 1942 311.28 1131.24 289.15 1941 310.99 1122.86 288.98 1940 310.90 1115.77 288.56 1939 310.57 1111.01 288.38 1938 310.06 1107.11 288.22 1937 309.44 1101.83 287.94 1936 308.75 1095.42 287.60 1935 308.35 1088.65 287.27 1934 308.14 1082.22 287.00 1933 307.95 1076.74 286.70 1932 307.63 1072.12 286.37 1931 307.22 1067.91 286.04 1930 306.78 1063.72 285.74 1929 306.34 1059.18 285.49 1928 306.05 1054.46 285.32 1927 305.83 1049.59 285.18 1926 305.58 1044.54 285.05 1925 305.16 1039.26 284.94 1924 304.63 1033.72 284.89 1923 304.15 1027.89 284.84 1922 303.81 1021.73 284.83 1921 303.46 1015.20 284.82 1920 303.08 1008.27 284.77 1919 302.68 999.89 284.67 1918 302.25 990.02 284.47 1917 301.81 980.12 284.22 1916 301.36 971.63 283.94 1915 300.91 966.02 283.63 1914 300.45 963.02 283.30 1913 300.04 961.97 282.96 1912 299.76 962.97 282.60 1911 299.56 962.24 282.14 1910 299.29 959.41 281.61 1909 298.96 954.87 281.04 1908 298.57 949.00 280.47 1907 298.13 942.17 279.92 1906 297.64 934.76 279.43 1905 297.09 927.15 279.04 1904 296.50 920.05 278.78 1903 295.91 915.27 278.61 1902 295.59 912.23 278.48 1901 295.53 909.98 278.32 1900 295.63 907.57 278.22 1899 295.83 903.21 278.13 1898 296.21 897.62 278.04 1897 296.32 893.56 278.02 1896 296.22 892.98 278.05 1895 295.98 892.55 278.10 1894 295.60 891.65 278.14 1893 295.12 890.37 278.15 1892 294.55 888.82 278.09 1891 293.87 887.11 278.05 1890 293.00 885.34 278.02 1889 292.15 883.93 278.00 1888 291.63 883.07 277.98 1887 291.58 882.56 277.94 1886 291.44 882.20 277.89 1885 290.97 881.89 277.81 1884 290.70 881.56 277.69 1883 290.69 881.13 277.52 1882 290.68 880.50 277.30 1881 290.60 879.60 276.96 1880 290.46 878.33 276.57 1879 290.28 876.61 276.17 1878 290.07 874.35 275.83 1877 289.82 871.47 275.58 1876 289.56 867.89 275.34 1875 289.28 863.51 275.08 1874 288.98 858.69 274.83 1873 288.67 855.23 274.57 1872 288.31 853.56 274.32 1871 287.90 852.92 274.09 1870 287.50 852.22 273.87 1869 287.12 850.66 273.67 1868 286.69 848.95 273.47 1867 286.25 847.34 273.28 1866 286.00 847.16 273.09 1865 285.91 846.85 272.91 1864 285.92 844.65 272.74 1863 286.00 840.82 272.57 1862 286.12 836.22 272.41 1861 286.25 831.63 272.27 1860 286.34 827.85 272.14 1859 286.36 825.51 272.01 1858 286.42 824.18 271.90 1857 286.46 823.55 271.79 1856 286.47 823.40 271.69 1855 286.48 823.53 271.60 1854 286.51 824.02 271.52 1853 286.63 825.77 271.44 1852 287.01 827.09 271.38 1851 287.16 827.01 271.31 1850 286.90 825.72 271.26 1849 286.41 823.51 271.21 1848 285.89 820.65 271.17 1847 285.48 817.41 271.13 1846 285.27 813.34 271.09 1845 285.30 807.88 271.06 1844 285.15 805.17 271.05 1843 284.90 805.98 271.05 1842 284.63 807.23 271.05 1841 284.36 806.35 271.05 1840 284.10 804.98 271.05 1839 283.89 803.47 271.05 1838 283.75 801.67 271.05 1837 283.71 799.57 271.07 1836 283.80 797.54 271.09 1835 283.90 795.93 271.11 1834 283.91 794.57 271.13 1833 283.88 793.29 271.16 1832 283.84 792.08 271.18 1831 283.77 790.92 271.20 1830 283.71 789.77 271.23 1829 283.64 788.61 271.26 1828 283.59 787.42 271.30 1827 283.54 786.16 271.34 1826 283.53 784.83 271.38 1825 283.53 783.47 271.43 1824 283.54 782.10 271.47 1823 283.56 780.74 271.53 1822 283.58 779.39 271.58 1821 283.60 778.07 271.63 1820 283.62 776.78 271.69 1819 283.63 775.54 271.75 1818 283.65 774.36 271.81 1817 283.66 773.25 271.87 1816 283.67 772.22 271.93 1815 283.67 771.27 272.00 1814 283.67 770.41 272.06 1813 283.66 769.61 272.12 1812 283.65 768.85 272.19 1811 283.63 768.13 272.25 1810 283.60 767.43 272.31 1809 283.56 766.77 272.38 1808 283.52 766.13 272.44 1807 283.46 765.50 272.50 1806 283.40 764.90 272.56 1805 283.32 764.30 272.62 1804 283.23 763.72 272.67 1803 283.13 763.13 272.73 1802 283.01 762.54 272.78 1801 282.89 761.95 272.83 1800 282.74 761.35 272.88