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.
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P Reforestation ."
Policy Implications of Greenhouse Warming: Mitigation, Adaptation, and the Science Base . Washington, DC: The National Academies Press,
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As of 2013, the National Science Education Standards have been replaced by the Next Generation Science Standards (NGSS), available as a print book, free PDF download, and online with our OpenBook platform.
The NGSS offer a detailed description of the key scientific ideas and practices that all students should learn by the time they graduate from high school. The standards are based largely on the 2011 National Research Council report A Framework for K-12 Science Education: Practices, Crosscutting Concepts, and Core Ideas.