Security was inseparable from the climate talks in Paris, from the safety of conference participants to how climate change impacts the stability of nations.

Just months after popular uprisings toppled Tunisia and Egypt’s authoritarian regimes, a trio of complex-system researchers published a brief article linking these demonstrations with high levels of the UN Food and Agriculture Organization’s international Food Price Index. Marco Lagi, Karla Bertrand, and Yaneer Bar-Yam’s model, which predicts outbreaks of deadly social conflict when the index tops 210, has since become a popular explanation wielded by many for bouts of popular unrest, including the Arab Spring and overthrow of Ukraine’s government. But were food prices really an underlying “hidden” cause for the start of a wave of instability that is still being felt today?