Houghton, R. A., and J. L. Hackler. 2001. Carbon Flux to the
Atmosphere from Land-Use Changes: 1850 to 1990. ORNL/CDIAC-131, NDP-050/R1.
Carbon Dioxide Information Analysis
Center, U.S. Department of Energy, Oak Ridge National Laboratory, Oak Ridge, Tennessee,
Figure 3. Comparison of estimates of net flux of carbon to the atmosphere from land-use changes,
1850 to 1990.