THE NATIONAL ACADEMIES PRESS    500 Fifth Street, NW     Washington, DC 20001

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 a grant from the U.S. Environmental Protection Agency under award number EP10H002179, U.S. Geological Survey under award number G10AP00149, U.S. Department of Energy under award number DE-PI0000010, TO #8, National Aeronautics and Space Administration under award number NNX11AB43G, U.S. Department of Agriculture under award number 59-0790-1-124, National Science Foundation under award number CBET-1135117, National Oceanic and Atmospheric Administration under award number WC133R-11-CQ-0048, TO #1, BP, Lockheed Martin, the David and Lucile Packard Foundation under award number 2011-36690, and the Cynthia and George Mitchell Foundation. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the views of the organizations or agencies that provided support for the project.

International Standard Book Number-13: 978-0-309-26230-9

International Standard Book Number-10: 0-309-26230-5

Additional copies of this report are available for sale from the National Academies Press, 500 Fifth Street, NW, Keck 360, Washington, DC 20001; (800) 624-6242 or (202) 334-3313;

Copyright 2013 by the National Academy of Sciences. All rights reserved.

Printed in the United States of America.

The National Academies | 500 Fifth St. N.W. | Washington, D.C. 20001
Copyright © National Academy of Sciences. All rights reserved.
Terms of Use and Privacy Statement