A recent Climatic Change review article reports a remarkable convergence of scientific evidence for a link between climatic events and violent intergroup conflict, thus departing markedly from other contemporary assessments of the empirical literature. This commentary revisits the review in order to understand the discrepancy. We believe the origins of the disagreement can be traced back to the review article's underlying quantitative meta-analysis,

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While both academics and politicians have long acknowledged the connection between food price shocks and so-called ‘food riots’, this article asks whether rising domestic consumer food prices are a contributing cause of sociopolitical unrest, more broadly defined, in urban areas of Africa. In order to unravel the complex and circular relationship between rising food prices and unrest, an instrumental approach with country fixed effects is used to isolate causality at the country-month unit of analysis for the period 1990 through 2012. Two instrumental variables, changes in international grain commodity prices and local rainfall scarcity, are evaluated and used individually and jointly as instruments for changes in domestic food prices. The main finding is that a sudden increase in domestic food prices in a given month significantly increases the probability of urban unrest, especially spontaneous events and riots, in that month. Undeniably, more fundamental economic and political grievances are also drivers of such events and are likely to determine how the unrest ultimately manifests, even when triggered by rising food prices. Although more research is necessary to determine why people choose particular protest methods and targets, the findings of this research provide evidence that sociopolitical unrest of different types is driven, or at least triggered, by a consumer response to economic pressure from increasing food prices regardless of the cause of the increase.

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