Climate
AND SOCIAL STRESS
Implications for Security Analysis
Committee on Assessing the Impacts of Climate Change on
Social and Political Stresses
John D. Steinbruner, Paul C. Stern, and Jo L. Husbands, Editors
Board on Environmental Change and Society
Division of Behavioral and Social Sciences and Education
NATIONAL RESEARCH COUNCIL
OF THE NATIONAL ACADEMIES
THE NATIONAL ACADEMIES PRESS
Washington, D.C.
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Committee on Assessing the Impacts of Climate Change on
Social and Political Stresses
John D. Steinbruner, Paul C. Stern, and Jo L. Husbands, Editors
Board on Environmental Change and Society
Division of Behavioral and Social Sciences and Education
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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 Govern-
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councils of the National Academy of Sciences, the National Academy of Engineer-
ing, and the Institute of Medicine. The members of the committee responsible for
the report were chosen for their special competences and with regard for appropri-
ate balance.
This study was supported by the U.S. intelligence community. Any opinions, find-
ings, 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: 978-0-309-27856-0
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Suggested Citation: National Research Council. (2013). Climate and Social Stress:
Implications for Security Analysis. Committee on Assessing the Impacts of Climate
Change on Social and Political Stresses, J.D. Steinbruner, P.C. Stern, and J.L.
H
usbands, Eds. Board on Environmental Change and Society, Division of ehavioral
B
and Social Sciences and Education. Washington, DC: The National Academies Press.
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COMMITTEE ON ASSESSING THE IMPACTS OF CLIMATE
CHANGE ON SOCIAL AND POLITICAL STRESSES
JOHN D. STEINBRUNER (Chair), Professor of Public Policy, University
of Maryland; Director, Center for International and Security Studies
at Maryland
OTIS B. BROWN, Director, Cooperative Institute for Climate and
Satellites, North Carolina State University
ANTONIO J. BUSALACCHI, JR., Director, Earth System Science
Interdisciplinary Center, University of Maryland; Professor,
Department of Atmospheric and Oceanic Science
DAVID EASTERLING, Chief, Scientific Services Division, National
Climatic Data Center, National Oceanic and Atmospheric
Administration, Asheville, NC
KRISTIE L. EBI, Consulting Professor, Department of Medicine, Stanford
University
THOMAS FINGAR, Oksenberg–Rohlen Distinguished Fellow and Senior
Scholar, Freeman Spogli Institute for International Studies, Stanford
University
LEON FUERTH, Distinguished Research Fellow, National Defense
University; Research Professor of International Affairs, George
Washington University; Founder and Director, Project on Forward
Engagement
SHERRI GOODMAN, Senior Vice President, General Counsel, and
Corporate Secretary, CNA Analysis and Solutions, Alexandria, VA;
Executive Director, CNA Military Advisory Board
ROBIN LEICHENKO, Associate Professor, Department of Geography,
Rutgers University
ROBERT J. LEMPERT, Director, Frederick S. Pardee Center for Longer
Range Global Policy and the Future Human Condition, RAND
Corporation, Santa Monica, CA
MARC LEVY, Deputy Director, Center for International Earth Science
Information Network, Earth Institute, Columbia University
DAVID LOBELL, Assistant Professor, Environmental Earth System
Science, Stanford University; Center Fellow, Program on Food
Security and the Environment, Stanford University
RICHARD STUART OLSON, Director of Extreme Event Research and
Professor, Department of Politics and International Relations, Florida
International University
RICHARD L. SMITH, Director, Statistical and Applied Mathematical
Sciences Institute, Research Triangle Park, NC
v
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PAUL C. STERN, Study Director
JO L. HUSBANDS, Scholar
ALICIA JARAMILLO-UNDERWOOD, Senior Program Assistant
MARY ANN KASPER, Senior Program Assistant
vi
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BOARD ON ENVIRONMENTAL CHANGE AND SOCIETY
RICHARD H. MOSS (Chair), Senior Staff Scientist, Joint Global Change
Research Institute, College Park, MD
ARUN AGRAWAL, Research Associate Dean, School of Natural
Resources and Environment, University of Michigan, Ann Arbor
JOSEPH ARVAI, Svare Chair in Applied Decision Research, University of
Calgary
ANTHONY BEBBINGTON, Higgins Professor of Environment and
Society, Director of the Graduate School of Geography, Clark
University
WILLIAM CHANDLER, President, Transition Energy, Annapolis, MD
F. STUART CHAPIN, III, Professor, University of Alaska–Fairbanks
RUTH DEFRIES, Denning Professor of Sustainable Development,
Department of Ecology, Evolution, and Environmental Biology,
Columbia University
KRISTIE L. EBI, Consulting Professor, Department of Medicine, Stanford
University
MARIA CARMEN LEMOS, Associate Professor, School of Natural
Resources and Environment, University of Michigan, Ann Arbor
DENNIS OJIMA, Senior Research Scientist, Natural Resource Ecology
Laboratory, Colorado State University
JONATHAN OVERPECK, Co-Director, Institute of the Environment,
University of Arizona
STEPHEN POLASKY, Professor of Ecological/Environmental Economics,
Department of Applied Economics, University of Minnesota
J. TIMMONS ROBERTS, Director, Center for Environmental Studies,
Professor of Sociology and Environmental Studies, Center for
Environmental Studies, Brown University
JAMES L. SWEENEY, Professor of Management Science and
Engineering, Stanford University
GARY W. YOHE, Woodhouse/Sysco Professor of Economics, Department
of Economics, Wesleyan University
MEREDITH A. LANE, Board Director
PAUL C. STERN, Senior Scholar
MARY ANN KASPER, Senior Program Assistant
vii
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Preface
C
ore features of the climate change situation are known with con-
fidence. The greenhouse effect associated with the carbon dioxide
molecule has been measured, as has the dwell time of that molecule
and its concentration in the atmosphere. We also know that the rate at
which carbon dioxide is currently being added to the atmosphere sub-
stantially exceeds the natural rate that prevailed before the rise of human
s
ocieties. That means that a large and unprecedentedly rapid thermal im-
pulse is being imparted to the earth’s ecology that will have to be balanced
in some fashion. We know beyond reasonable doubt that the consequences
will be extensive. We do not, however, know the timing, magnitude, or
character of those consequences with sufficient precision to make predic-
tions that meet scientific standards of confidence.
In principle the thermal impulse could be mitigated to a degree that
would presumably preserve the current operating conditions of human
societies, but the global effort required to do that is not being undertaken
and cannot be presumed. As a practical matter, that means that significant
burdens of adaptation will be imposed on all societies and that unusually
severe climate perturbations will be encountered in some parts of the world
over the next decade with increasing frequency and severity thereafter.
There is a compelling reason to presume that specific failures of adaptation
will occur with consequences more severe than any yet experienced, severe
enough to compel more extensive international engagement than has yet
been anticipated or organized.
This report has been prepared at the request of the U.S. intelligence
community with these circumstances in mind. It summarizes what is cur-
ix
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x PREFACE
rently known about the security effects of climate perturbations, admitting
the inherent complexities and the very considerable uncertainties involved.
But under the presumption that these effects will be of increasing signifi-
cance, it outlines the monitoring activities that the intelligence community
should be developing in support of improved anticipation, more effective
prevention efforts, and more decisive emergency reaction when that be-
comes necessary.
The report was prepared by the members of the committee, all of whom
helped shape the assessment presented and many of whom drafted elements
of the text. The burden of constructing a coherent whole from individual
contributions fell primarily to Paul Stern and Jo Husbands as the principal
editors of the report. Alicia Jaramillo-Underwood and Mary Ann Kasper
provided essential administrative support. National Research Council Fel-
low Andrei Israel and intern Zafar Imran provided research support and
assisted in the preparation of parts of the text. I am personally grateful for
all of these contributions.
John D. Steinbruner, Chair
Committee on Assessing the Impacts of
Climate Change on Social and Political Stresses
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Acknowledgments
T
his report has been reviewed in draft form by individuals chosen for
their diverse perspectives and technical expertise, in accordance with
procedures approved by the National Academies’ Report Review
Committee. The purpose of this independent review is to provide candid
and critical comments that will assist the institution in making its published
report as sound as possible and to ensure that the report meets institutional
standards for objectivity, evidence, and responsiveness to the study charge.
The review comments and draft manuscript remain confidential to protect
the integrity of the process.
We wish to thank the following individuals for their review of this re-
port: Marc F. Bellemare, Sanford School of Public Policy, Duke University;
Andrew Brown, Jr., Innovation and Technology Office, Delphi Corpora-
tion, Troy, Michigan; Jared L. Cohon, Office of the President, Carnegie
Mellon University; Geoff Dabelko, Environmental Change and Security
Program, Woodrow Wilson Center; Delores M. Etter, Caruth Institute for
Engineering Education, Southern Methodist University; John Gannon, BAE
Systems, Arlington, Virginia; James R. Johnson, (retired) Minnesota Min-
ing and Manufacturing Company, Oak Park Heights, Minnesota; John E.
Kutzbach, Center for Climatic Research, University of Wisconsin–Madison;
Monty G. Marshall, Center for Global Policy, George Mason University
and Center for Systemic Peace, Societal-Systems Research, Inc.; Dennis
Ojima, Ecosystem Science and Sustainability, Warner College of Natural
Resources, Colorado State University; Reto Ruedy, NASA Goddard In-
stitute for Space Studies; and Philip A. Schrodt, Department of Political
Science, Pennsylvania State University.
xi
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xii ACKNOWLEDGMENTS
Although the reviewers listed above have provided many constructive
comments and suggestions, they were not asked to endorse the conclusions
or recommendations, nor did they see the final draft of the report before its
release. The review of this report was overseen by Warren M. Washington,
Climate Change Research Section, Climate and Global Dynamics Division,
National Center for Atmospheric Research, and Thomas J. Wilbanks, En-
vironmental Sciences Division, Oak Ridge National Laboratory. Appointed
by the National Academies, they were responsible for making certain that
an independent examination of this report was carried out in accordance
with institutional procedures and that all review comments were carefully
considered. Responsibility for the final content of this report rests entirely
with the authoring committee and the institution.
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Contents
Summary 1
1 Climate Change as a National Security Concern 15
Potential Climate–Security Connections, 17
Increasing Risks of Disruptive Climate Events, 21
The Focus of This Study, 30
Structure of the Report, 33
2 Climate Change, Vulnerability, and National Security:
A Conceptual Framework 35
Connections Between Climate Events and National Security, 36
Implications of the Conceptual Framework, 43
Strategies for Security Analysis, 48
3 Potentially Disruptive Climate Events 53
The Science of Climate Projection, 54
Abrupt Climate Change, 58
Single Extreme Events, 61
Clusters of Extreme Events, 68
Sequences of Events, 70
Global System Shocks, 71
Surprises Arising from Poorly Resolved Climate Dynamics, 72
Conclusions and Recommendations, 73
xiii
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xiv CONTENTS
4 How Climate Events Can Lead to Social and Political Stresses 75
Local and Distant Effects, 76
Exposures, 82
Susceptibility to Harm from Climate Events, 84
Coping, Response, and Recovery, 87
Conclusions and Recommendations, 91
5 Climate Events and National Security Outcomes 97
Water, Food, and Health Security, 98
Humanitarian Crises, 111
Disruptive Migration, 112
Severe Political Instability and State Failure, 117
Interstate and Intrastate Conflict and Violence, 125
Conclusions and Recommendations, 134
6 Methods for Assessing National Security Threats 139
What Should Be Monitored and Why, 140
Challenges of Monitoring, 143
A Strategy for Monitoring, 153
An Approach to Anticipating Risks, 158
References 161
Appendixes
A Committee Member and Staff Biographies 179
B Briefings Received by the Committee 187
C Method for Developing Figure 3-1 189
D Statistical Methods for Assessing Probabilities of Extreme Events 193
E Foundations for Monitoring Climate–Security Connections 203