13 226 Fossil carbon emissions for 1860 to 1984 as tabulated in "Trends 91: A Compendium of Data on Global Change". Updated values for 1985 to 1990 were obtained from G. Marland (personal communication). Data for 1840 to 1860 were obtained by linear interpolation. Pre-1840 values were set to zero. Units are time in years, annual carbon flux in gigatons of C. Source: (1) Data for 1860 to 1949 -- C.D. Keeling, Scripps Institution of Oceanography, La Jolla, California, U.S.A. (2) Data for 1950 on -- G. Marland and T.A. Boden, Oak Ridge National Laboratory, Oak Ridge, Tennessee, U.S.A. Time Carbon flux 1765.5 0.000 1766.5 0.000 1767.5 0.000 1768.5 0.000 1769.5 0.000 1770.5 0.000 1771.5 0.000 1772.5 0.000 1773.5 0.000 1774.5 0.000 1775.5 0.000 1776.5 0.000 1777.5 0.000 1778.5 0.000 1779.5 0.000 1780.5 0.000 1781.5 0.000 1782.5 0.000 1783.5 0.000 1784.5 0.000 1785.5 0.000 1786.5 0.000 1787.5 0.000 1788.5 0.000 1789.5 0.000 1790.5 0.000 1791.5 0.000 1792.5 0.000 1793.5 0.000 1794.5 0.000 1795.5 0.000 1796.5 0.000 1797.5 0.000 1798.5 0.000 1799.5 0.000 1800.5 0.000 1801.5 0.000 1802.5 0.000 1803.5 0.000 1804.5 0.000 1805.5 0.000 1806.5 0.000 1807.5 0.000 1808.5 0.000 1809.5 0.000 1810.5 0.000 1811.5 0.000 1812.5 0.000 1813.5 0.000 1814.5 0.000 1815.5 0.000 1816.5 0.000 1817.5 0.000 1818.5 0.000 1819.5 0.000 1820.5 0.000 1821.5 0.000 1822.5 0.000 1823.5 0.000 1824.5 0.000 1825.5 0.000 1826.5 0.000 1827.5 0.000 1828.5 0.000 1829.5 0.000 1830.5 0.000 1831.5 0.000 1832.5 0.000 1833.5 0.000 1834.5 0.000 1835.5 0.000 1836.5 0.000 1837.5 0.000 1838.5 0.000 1839.5 0.000 1840.5 0.000 1841.5 0.000 1842.5 0.000 1843.5 0.000 1844.5 0.000 1845.5 0.006 1846.5 0.012 1847.5 0.019 1848.5 0.025 1849.5 0.031 1850.5 0.037 1851.5 0.044 1852.5 0.050 1853.5 0.056 1854.5 0.062 1855.5 0.068 1856.5 0.075 1857.5 0.081 1858.5 0.087 1859.5 0.093 1860.5 0.093 1861.5 0.099 1862.5 0.098 1863.5 0.106 1864.5 0.115 1865.5 0.122 1866.5 0.129 1867.5 0.138 1868.5 0.137 1869.5 0.142 1870.5 0.145 1871.5 0.162 1872.5 0.176 1873.5 0.188 1874.5 0.184 1875.5 0.189 1876.5 0.192 1877.5 0.196 1878.5 0.197 1879.5 0.208 1880.5 0.227 1881.5 0.244 1882.5 0.263 1883.5 0.280 1884.5 0.282 1885.5 0.276 1886.5 0.279 1887.5 0.298 1888.5 0.322 1889.5 0.328 1890.5 0.350 1891.5 0.365 1892.5 0.369 1893.5 0.362 1894.5 0.377 1895.5 0.399 1896.5 0.412 1897.5 0.432 1898.5 0.455 1899.5 0.497 1900.5 0.525 1901.5 0.540 1902.5 0.553 1903.5 0.606 1904.5 0.613 1905.5 0.647 1906.5 0.696 1907.5 0.771 1908.5 0.737 1909.5 0.769 1910.5 0.805 1911.5 0.822 1912.5 0.866 1913.5 0.929 1914.5 0.838 1915.5 0.831 1916.5 0.895 1917.5 0.945 1918.5 0.932 1919.5 0.829 1920.5 0.959 1921.5 0.828 1922.5 0.891 1923.5 1.005 1924.5 0.989 1925.5 1.006 1926.5 1.006 1927.5 1.097 1928.5 1.091 1929.5 1.172 1930.5 1.077 1931.5 0.968 1932.5 0.874 1933.5 0.919 1934.5 0.996 1935.5 1.032 1936.5 1.146 1937.5 1.226 1938.5 1.161 1939.5 1.233 1940.5 1.300 1941.5 1.337 1942.5 1.334 1943.5 1.364 1944.5 1.352 1945.5 1.204 1946.5 1.271 1947.5 1.422 1948.5 1.517 1949.5 1.497 1950.5 1.638 1951.5 1.775 1952.5 1.803 1953.5 1.848 1954.5 1.871 1955.5 2.050 1956.5 2.185 1957.5 2.278 1958.5 2.338 1959.5 2.471 1960.5 2.586 1961.5 2.602 1962.5 2.708 1963.5 2.855 1964.5 3.016 1965.5 3.154 1966.5 3.314 1967.5 3.420 1968.5 3.596 1969.5 3.809 1970.5 4.091 1971.5 4.242 1972.5 4.409 1973.5 4.648 1974.5 4.656 1975.5 4.629 1976.5 4.895 1977.5 5.034 1978.5 5.082 1979.5 5.366 1980.5 5.264 1981.5 5.129 1982.5 5.094 1983.5 5.085 1984.5 5.243 1985.5 5.416 1986.5 5.600 1987.5 5.698 1988.5 5.912 1989.5 6.024 1990.5 6.097