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The opinions, findings, and conclusions or recommendations contained in this document are those of the authors and do not necessarily reflect the views of the sponsors (the National Science Foundation, the Department of Interior U.S. Geological Survey, the National Geographic Society, and the Association of American Geographers). Mention of trade names or commercial products does not constitute their endorsement by the U.S. government. Supported by the National Science Foundation under Grant No. BCS-0631200; by the Department of Interior U.S. Geological Survey under Award No. 07HQGR0157; and by the National Geographic Society under Award No. 2007-0923.

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