The US carbon budget: Contributions from land-use change

The rates at which lands in the United States were cleared for agriculture, abandoned, harvested for wood, and burned were reconstructed from historic al data for the period 1700-1990 and used in a terrestrial carbon model to calculate annual changes in the amount of carbon stored in terrestrial ecos ystems, including wood products. Changes in land use released 27 +/- 6 peta grams of carbon to the atmosphere before 1945 and accumulated 2 +/- 2 petag rams of carbon after 1945, Largely as a result of fire suppression and fore st growth on abandoned farmlands. During the 1980s, the net flux of carbon attributable to land management offset 10 to 30 percent of U.S. fossil fuel emissions.