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 2. Net flux of carbon to the atmosphere from land-use changes, by region, 1850 to 1990.