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1. Tons (t) are metric; 1 Mt = 1 megaton = 1 million tons.
Moulton, R. J., and K. R. Richards. 1990. Costs of sequestering
carbon through tree planting and forest management in the United
States. U.S. Forest Service Report. Draft. U.S. Department of
Agriculture, Washington, D.C.
Trexler, M. C. 1990. Minding the carbon store: Weighing U.S.
forest strategies to slow global warming. Draft. World Resources
Institute, Washington, D.C.