This file compares the estimated global total net flux of carbon to the atmosphere from land-use change, from 1850 through 1990, by year, for this database (Houghton 1999) and three earlier publications (Houghton et al. 1983, Houghton and Skole 1990, and Houghton and Hackler 1995). Note that the data for the period 1850-1859 attributed below to Houghton et al. (1983) were not actually presented in that publication but are present in the data used in that publication. Units = Pg C (1 petagram = 10^15 grams); -9.999 denotes missing value Year Houghton Houghton Houghton Houghton et al. 1983 & Skole 1990 & Hackler 1995 1999 1850 0.458 0.278 0.352 0.397 1851 0.464 0.319 0.383 0.397 1852 0.469 0.353 0.397 0.400 1853 0.475 0.379 0.408 0.404 1854 0.480 0.393 0.417 0.407 1855 0.486 0.424 0.424 0.410 1856 0.492 0.439 0.430 0.413 1857 0.497 0.452 0.435 0.416 1858 0.503 0.464 0.439 0.419 1859 0.509 0.475 0.443 0.422 1860 0.539 0.492 0.446 0.423 1861 0.563 0.485 0.457 0.427 1862 0.587 0.492 0.463 0.421 1863 0.612 0.500 0.468 0.423 1864 0.623 0.508 0.474 0.424 1865 0.634 0.516 0.479 0.426 1866 0.641 0.522 0.481 0.427 1867 0.649 0.528 0.484 0.427 1868 0.656 0.534 0.486 0.428 1869 0.665 0.541 0.489 0.429 1870 0.684 0.544 0.492 0.433 1871 0.701 0.553 0.501 0.461 1872 0.717 0.562 0.507 0.471 1873 0.731 0.566 0.512 0.479 1874 0.744 0.572 0.513 0.483 1875 0.771 0.579 0.517 0.488 1876 0.792 0.585 0.521 0.491 1877 0.813 0.589 0.524 0.493 1878 0.834 0.592 0.526 0.495 1879 0.846 0.594 0.528 0.496 1880 0.857 0.621 0.529 0.497 1881 0.868 0.639 0.560 0.535 1882 0.878 0.658 0.569 0.546 1883 0.888 0.669 0.576 0.556 1884 0.897 0.679 0.582 0.564 1885 0.905 0.686 0.586 0.572 1886 0.910 0.692 0.590 0.577 1887 0.915 0.696 0.592 0.579 1888 0.919 0.700 0.593 0.581 1889 0.923 0.702 0.594 0.583 1890 0.936 0.701 0.593 0.584 1891 0.944 0.694 0.597 0.584 1892 0.951 0.688 0.597 0.583 1893 0.959 0.683 0.597 0.581 1894 0.966 0.679 0.597 0.579 1895 0.973 0.676 0.597 0.577 1896 0.979 0.673 0.597 0.578 1897 0.985 0.672 0.596 0.579 1898 0.991 0.674 0.596 0.580 1899 0.997 0.676 0.595 0.582 1900 1.027 0.732 0.596 0.583 1901 1.048 0.765 0.660 0.655 1902 1.070 0.791 0.678 0.678 1903 1.092 0.811 0.693 0.697 1904 1.100 0.828 0.705 0.713 1905 1.108 0.844 0.716 0.728 1906 1.113 0.851 0.726 0.741 1907 1.117 0.856 0.731 0.748 1908 1.122 0.860 0.735 0.753 1909 1.126 0.862 0.738 0.757 1910 1.133 0.815 0.740 0.760 1911 1.138 0.788 0.686 0.704 1912 1.143 0.762 0.670 0.687 1913 1.153 0.762 0.646 0.658 1914 1.158 0.758 0.639 0.648 1915 1.164 0.750 0.630 0.636 1916 1.167 0.750 0.634 0.640 1917 1.170 0.749 0.635 0.639 1918 1.173 0.750 0.637 0.639 1919 1.175 0.751 0.639 0.639 1920 1.177 0.789 0.641 0.637 1921 1.179 0.808 0.691 0.682 1922 1.181 0.823 0.707 0.695 1923 1.182 0.836 0.722 0.706 1924 1.184 0.842 0.734 0.715 1925 1.281 0.866 0.745 0.723 1926 1.360 0.875 0.753 0.730 1927 1.441 0.883 0.755 0.733 1928 1.507 0.866 0.757 0.736 1929 1.527 0.844 0.736 0.711 1930 1.548 0.856 0.730 0.707 1931 1.569 0.861 0.740 0.723 1932 1.591 0.862 0.737 0.723 1933 1.614 0.860 0.732 0.722 1934 1.637 0.857 0.730 0.722 1935 1.660 0.852 0.724 0.719 1936 1.683 0.850 0.729 0.730 1937 1.705 0.849 0.727 0.728 1938 1.717 0.849 0.719 0.725 1939 1.736 0.850 0.715 0.721 1940 1.756 0.839 0.707 0.714 1941 1.773 0.810 0.702 0.720 1942 1.791 0.808 0.695 0.719 1943 1.808 0.808 0.688 0.717 1944 1.832 0.812 0.685 0.719 1945 1.856 0.820 0.682 0.720 1946 1.880 0.830 0.736 0.793 1947 1.904 0.844 0.751 0.811 1948 1.927 0.861 0.761 0.825 1949 1.950 0.878 0.767 0.834 1950 2.101 0.990 0.774 0.846 1951 2.186 1.150 0.986 1.064 1952 2.265 1.234 1.037 1.125 1953 2.340 1.294 1.045 1.128 1954 2.360 1.418 1.068 1.161 1955 2.374 1.482 1.109 1.214 1956 2.390 1.528 1.128 1.246 1957 2.405 1.478 1.146 1.275 1958 2.417 1.483 1.156 1.297 1959 2.429 1.488 1.084 1.232 1960 2.437 1.573 1.084 1.241 1961 2.447 1.625 1.217 1.387 1962 2.455 1.663 1.255 1.431 1963 2.463 1.700 1.293 1.476 1964 2.469 1.735 1.322 1.512 1965 2.562 1.768 1.348 1.542 1966 2.632 1.747 1.355 1.551 1967 2.700 1.758 1.360 1.559 1968 2.768 1.775 1.368 1.570 1969 2.776 1.783 1.377 1.582 1970 2.721 1.684 1.357 1.564 1971 2.699 1.669 1.250 1.438 1972 2.677 1.632 1.215 1.394 1973 2.655 1.609 1.232 1.416 1974 2.653 1.567 1.233 1.406 1975 2.650 1.595 1.234 1.394 1976 2.646 1.611 1.324 1.497 1977 2.640 1.631 1.350 1.519 1978 2.633 1.616 1.367 1.533 1979 2.624 1.609 1.413 1.577 1980 2.613 1.608 1.423 1.595 1981 -9.999 1.608 1.420 1.870 1982 -9.999 1.608 1.450 1.929 1983 -9.999 1.608 1.470 1.973 1984 -9.999 1.608 1.519 2.041 1985 -9.999 1.608 1.539 2.079 1986 -9.999 -9.999 1.574 2.150 1987 -9.999 -9.999 1.605 2.163 1988 -9.999 -9.999 1.619 2.185 1989 -9.999 -9.999 1.611 2.187 1990 -9.999 -9.999 1.614 2.103