Climate change and the opportunity cost of conflict.

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ID: 80827
2020
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Ranked #112 of 292 articles by views in Proceedings of the National Academy of Sciences of the United States of America

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Abstract
A growing empirical literature associates climate anomalies with increased risk of violent conflict. This association has been portrayed as a bellwether of future societal instability as the frequency and intensity of extreme weather events are predicted to increase. This paper investigates the theoretical foundation of this claim. A seminal microeconomic model of opportunity costs-a mechanism often thought to drive climate-conflict relationships-is extended by considering realistic changes in the distribution of climate-dependent agricultural income. Results advise caution in using empirical associations between short-run climate anomalies and conflicts to predict the effect of sustained shifts in climate regimes: Although war occurs in bad years, conflict may decrease if agents expect more frequent bad years. Theory suggests a nonmonotonic relation between climate variability and conflict that emerges as agents adapt and adjust their behavior to the new income distribution. We identify 3 measurable statistics of the income distribution that are each unambiguously associated with conflict likelihood. Jointly, these statistics offer a unique signature to distinguish opportunity costs from competing mechanisms that may relate climate anomalies to conflict.
Reference Key
roche2020climateproceedings Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Roche, Kevin R;Müller-Itten, Michèle;Dralle, David N;Bolster, Diogo;Müller, Marc F;
Journal Proceedings of the National Academy of Sciences of the United States of America
Year 2020
DOI
201914829
URL
Keywords
agriculture violence rainfall income shock microeconomic theory

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