NE - RWU 4104

Last modified 09/30/08

Smith, James E., Heath, Linda S. 2008.

Carbon stocks and stock changes in U.S. forests, and Appendix C. P. 65-80, C-1-C-7 In: U.S. Department of Agriculture. U.S. Agriculture and Forestry Greenhouse Gas Inventory: 1990-2005. Technical Bulletin No. 1921. Washington, DC: 65-80.


Forest ecosystems and forest products represent significant carbon sinks in the United States, approximately equal to 10% of total U.S. greenhouse gas (GHG) emissions (EPA 2007). The net amount of carbon stored—that is, annual incremental increase—by forests in the conterminous U.S. increased by an estimated 595 and 103 Tg CO2 eq. in 2005 for forest ecosystems and harvested wood products, respectively. Total Sequestration in 2005 was estimated to be 699 Tg CO2 eq. and the calculated 95% confidence interval for this flux was -890 to -513 Tg CO2 eq. (Table 4-1). Compared to 1990, CO2 sequestered by forest systems was about 17% greater in 2005 (Table 4-2). Current total carbon stocks in forest ecosystems of the conterminous United States are estimated at about 150 Pg CO2 eq. (Table 4-2, Pg=1,000 Tg).

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