Climate and Conflict

54 Pages Posted: 22 Oct 2014 Last revised: 14 Apr 2021

See all articles by Marshall Burke

Marshall Burke

University of California, Berkeley; Stanford University - Freeman Spogli Institute for International Studies

Solomon Hsiang

University of California, Berkeley; National Bureau of Economic Research

Edward Miguel

University of California, Berkeley - Department of Economics; National Bureau of Economic Research (NBER)

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Date Written: October 2014

Abstract

Until recently, neither climate nor conflict have been core areas of inquiry within economics, but there has been an explosion of research on both topics in the past decade, with a particularly large body of research emerging at their intersection. In this review, we survey this literature on the interlinkages between climate and conflict, by necessity drawing from both economics and other disciplines given the inherent interdisciplinarity of research in this field. We consider many types of human conflict in the review, including both interpersonal conflict -- such as domestic violence, road rage, assault, murder, and rape -- and intergroup conflict -- including riots, ethnic violence, land invasions, gang violence, civil war and other forms of political instability, such as coups. We discuss the key methodological issues in estimating causal relationships in this area, and largely focus on "natural experiments" that exploit variation in climate variables over time, helping to address omitted variable bias concerns. After harmonizing statistical specifications and standardizing estimated effect sizes within each conflict category, we carry out a hierarchical meta-analysis that allows us to estimate the mean effect of climate variation on conflict outcomes as well as to quantify the degree of variability in this effect size across studies. Looking across 55 studies, we find that deviations from moderate temperatures and precipitation patterns systematically increase the risk of conflict, often substantially, with average effects that are highly statistically significant. We find that contemporaneous temperature has the largest average effect by far, with each 1σ increase toward warmer temperatures increasing the frequency of contemporaneous interpersonal conflict by 2.4% and of intergroup conflict by 11.3%, but that the 2-period cumulative effect of rainfall on intergroup conflict is also substantial (3.5%/σ). We also quantify heterogeneity in these effect estimates across settings that is likely important. We conclude by highlighting remaining challenges in this field and the approaches we expect will be most effective at solving them, including identifying mechanisms that link climate to conflict, measuring the ability of societies to adapt to climate changes, and understanding the likely impacts of future global warming.

Suggested Citation

Burke, Marshall and Hsiang, Solomon and Miguel, Edward, Climate and Conflict (October 2014). NBER Working Paper No. w20598, Available at SSRN: https://ssrn.com/abstract=2513158

Marshall Burke (Contact Author)

University of California, Berkeley ( email )

310 Barrows Hall
Berkeley, CA 94720
United States

Stanford University - Freeman Spogli Institute for International Studies ( email )

Stanford, CA 94305
United States

Solomon Hsiang

University of California, Berkeley ( email )

2607 Hearst Avenue
Berkeley, CA 94720-7320
United States

HOME PAGE: http://gspp.berkeley.edu/directories/faculty/solomon-hsiang

National Bureau of Economic Research ( email )

1050 Massachusetts Avenue
Cambridge, MA 02138
United States

Edward Miguel

University of California, Berkeley - Department of Economics ( email )

549 Evans Hall #3880
Berkeley, CA 94720-3880
United States

National Bureau of Economic Research (NBER)

1050 Massachusetts Avenue
Cambridge, MA 02138
United States

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