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NOTICE: The project that is the subject of this report was approved by the Governing Board of the National Research Council, whose members are drawn from the councils of the National Academy of Sciences, the National Academy of Engineering, and the Institute of Medicine. The members of the committee responsible for the report were chosen for their special competences and with regard for appropriate balance.

This study was supported by the National Science Foundation and the National Aeronautics and Space Administration under Grant No. ATM-0135923, the National Oceanic and Atmospheric Administration under Contract No. 52-DGNA-1-90024, and the Environmental Protection Agency under Purchase Order No. 2W-0373-NANX. Any opinions, findings, and conclusions or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the views of the agencies that provided support for this project.

International Standard Book Number-13: 978-0-309-10331-2

International Standard Book Number-10: 0-309-10331-2

Cover: Satellite photo of smoke emanating from large wildfires along the Alaska-Canada border and spreading across Alaska and into Siberia and the Arctic. Courtesy of NASA.

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