Acknowledgments

I thank Rattan Lal for his encouragement in preparing this review. I am also grateful for the technical advice and information received from J.E. Amonette (United States), R. Casas (Argentina), J. Etchevers (Mexico), E.R. Hunt (United States), B.G. McConkey (Canada), S.D. Prince (United States), T. Scholz (United States), L. Tieszen (United States), and E. Venteris (United States). The preparation of this review was supported by the U.S. Department of Energy, Office of Science, Carbon Sequestration in Terrestrial Ecosystems program, the U.S. Department of Agriculture Consortium for Agricultural Soils Mitigation of Greenhouse Gases, and the National Aer-onatics and Space Administration Office of Earth Science Applications Division.

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