Global Mean CO2 Mixing Ratios (ppm): Observations ---------------------------------------------------------------------------------- Data Data Source Year MixR Yar MixR Source Year MixR Year MixR ---------------------------------------------------------------------------------- Ice- 1850 285.2 1900 295.7 1950 311.3 2000 369.64 Core 1851 285.1 1901 296.2 1951 311.8 2001 371.15 Data 1852 285.0 1902 296.6 1952 312.2 2002 373.15 Adjus- 1853 285.0 1903 297.0 1953 312.6 2003 375.64 ted 1854 284.9 1904 297.5 1954 313.2 NOAA/ 2004 377.44 for 1855 285.1 1905 298.0 1955 313.7 ESRL/ 2005 379.46 Global 1856 285.4 1906 298.4 1956 314.3 trends 2006 381.59 Mean 1857 285.6 1907 298.8 1957 314.8 change 2007 383.37 1858 285.9 1908 299.3 SIO 1958 315.34 added 2008 385.46 1859 286.1 1909 299.7 Mauna 1959 316.18 to 2009 386.95 1860 286.4 1910 300.1 Loa 1960 317.07 2003 2010 389.21 1861 286.6 1911 300.6 & 1961 317.73 data 2011 391.15 1862 286.7 1912 301.0 South 1962 318.43 1863 286.8 1913 301.3 Pole 1963 319.08 1864 286.9 1914 301.4 Adjus- 1964 319.65 1865 287.1 1915 301.6 ted 1965 320.23 1866 287.2 1916 302.0 for 1966 321.59 1867 287.3 1917 302.4 Global 1967 322.31 1868 287.4 1918 302.8 Mean 1968 323.04 1869 287.5 1919 303.0 1969 324.23 1870 287.7 1920 303.4 1970 325.54 1871 287.9 1921 303.7 1971 326.42 1872 288.0 1922 304.1 1972 327.45 1873 288.2 1923 304.5 1973 329.43 1874 288.4 1924 304.9 1974 330.21 1875 288.6 1925 305.3 CMDL 1975 331.36 1876 288.7 1926 305.8 InSitu 1976 331.92 1877 288.9 1927 306.2 Mauna 1977 333.73 1878 289.5 1928 306.6 Loa 1978 335.42 1879 290.1 1929 307.2 & 1979 337.10 1880 290.8 1930 307.5 South 1980 338.99 1881 291.4 1931 308.0 Pole 1981 340.36 1882 292.0 1932 308.3 1982 341.57 1883 292.5 1933 308.9 CMDL 1983 342.53 1884 292.9 1934 309.3 Flask 1984 344.24 1885 293.3 1935 309.7 Mean 1985 345.72 1886 293.8 1936 310.1 of 1986 347.15 1887 294.0 1937 310.6 Many 1987 348.93 1888 294.1 1938 311.0 Sites 1988 351.47 1889 294.2 1939 311.2 1989 353.15 1890 294.4 1940 311.3 1990 354.29 1891 294.6 1941 311.0 1991 355.68 1892 294.8 1942 310.7 1992 356.42 1893 294.7 1943 310.5 1993 357.13 1894 294.8 1944 310.2 1994 358.61 1895 294.8 1945 310.3 1995 360.67 1896 294.9 1946 310.3 1996 362.58 1897 294.9 1947 310.4 1997 363.48 1898 294.9 1948 310.5 1998 366.27 1899 295.3 1949 310.9 1999 368.38 ---------------------------------------------------------------------------------- Global Mean CO2 Mixing Ratio (ppm): Future Scenarios ---------------------------------------------------------------------------------- Alternative Scenario 2 Degree C Scenario Year MixR Year MixR Year MixR Year MixR ---------------------------------------------------------------------------------- 2000 370.0 2050 445.0 2000 370.0 2050 486.2 2001 371.7 2051 446.2 2001 371.7 2051 489.2 2002 373.4 2052 447.4 2002 373.4 2052 492.1 2003 375.1 2053 448.5 2003 375.1 2053 494.9 2004 376.8 2054 449.6 2004 376.9 2054 497.6 2005 378.4 2055 450.8 2005 378.7 2055 500.4 2006 380.1 2056 451.8 2006 380.5 2056 503.0 2007 381.7 2057 452.9 2007 382.3 2057 505.6 2008 383.4 2058 453.9 2008 384.2 2058 508.1 2009 385.0 2059 454.9 2009 386.2 2059 510.6 2010 386.6 2060 455.9 2010 388.0 2060 513.0 2011 388.2 2061 456.9 2011 390.0 2061 515.4 2012 389.9 2062 457.8 2012 392.0 2062 517.7 2013 391.5 2063 458.7 2013 394.0 2063 519.8 2014 393.1 2064 459.6 2014 396.0 2064 522.0 2015 394.6 2065 460.4 2015 398.0 2065 524.1 2016 396.2 2066 461.3 2016 400.1 2066 526.2 2017 397.8 2067 462.1 2017 402.3 2067 528.1 2018 399.4 2068 462.9 2018 404.4 2068 530.1 2019 400.9 2069 463.6 2019 406.5 2069 532.0 2020 402.5 2070 464.4 2020 408.7 2070 533.8 2021 404.0 2071 465.1 2021 410.9 2071 535.5 2022 405.5 2072 465.7 2022 413.1 2072 537.2 2023 407.0 2073 466.4 2023 415.4 2073 538.8 2024 408.5 2074 467.0 2024 417.7 2074 540.3 2025 410.0 2075 467.6 2025 420.0 2075 541.8 2026 411.5 2076 468.2 2026 422.4 2076 543.3 2027 413.0 2077 468.8 2027 424.7 2077 544.7 2028 414.5 2078 469.3 2028 427.1 2078 546.0 2029 416.0 2079 469.9 2029 429.5 2079 547.3 2030 417.5 2080 470.4 2030 432.0 2080 548.5 2031 418.9 2081 470.8 2031 434.4 2081 549.7 2032 420.4 2082 471.2 2032 436.9 2082 550.8 2033 421.8 2083 471.7 2033 439.5 2083 551.7 2034 423.2 2084 472.1 2034 442.0 2084 552.7 2035 424.6 2085 472.4 2035 444.5 2085 553.6 2036 426.1 2086 472.8 2036 447.1 2086 554.5 2037 427.5 2087 473.1 2037 449.8 2087 555.2 2038 428.9 2088 473.4 2038 452.5 2088 556.0 2039 430.2 2089 473.6 2039 455.1 2089 556.7 2040 431.6 2090 473.9 2040 457.8 2090 557.2 2041 433.0 2091 474.1 2041 460.5 2091 557.8 2042 434.4 2092 474.3 2042 463.2 2092 558.3 2043 435.7 2093 474.5 2043 466.0 2093 558.7 2044 437.1 2094 474.6 2044 468.9 2094 559.0 2045 438.4 2095 474.8 2045 471.7 2095 559.3 2046 439.8 2096 474.9 2046 474.5 2096 559.6 2047 441.1 2097 474.9 2047 477.4 2097 559.8 2048 442.4 2098 475.0 2048 480.3 2098 560.0 2049 443.7 2099 475.0 2049 483.3 2099 560.0 ---------------------------------------------------------------------------------- References 1850-1957: D.M. Etheridge, L.P. Steele, R.L. Langenfelds, R.J. Francey, J.-M. Barnola and V.I. Morgan, 1996, J. Geophys. Res., 101, 4115-4128, "Natural and anthroupogenic changes in atmospheric CO2 over the last 1000 years from air in Antarctic ice and firn". 1958-1974: Means of Scripps Institution of Oceanography Continuous Data at Mauna Loa and South Pole provided by KenMaarie (personal communication) 1975-1982: Means of NOAA/CMDL in-situ data at Mauna Loa and South Pole. (P. Tans and K.W. Thoning, ftp://ftp.cmdl.noaa.gov/ccg/co2/in-situ) 1983-2003: Global means constructed using about 70 CMDL CCGG Sampling Network station data. (P.P. Tans and T.J. Conway, ftp://ftp.cmdl.noaa.gov/ccg/co2/flask) 2004-2007: Global mean growth rates. (T. Conway, ftp://ftp.cmdl.noaa.gov/ccg/co2/trends)