Scientific American reports: Climate change can make storms stronger, cold spells longer and water supplies drier. But can it cause war? A new study published today in Proceedings of the National Academy of Sciences says drought in Syria, exacerbated to record levels by global warming, pushed social unrest in that nation across a line into an open uprising in 2011. The conflict has since become a major civil war with international involvement.

Drying and drought in Syria from 2006 to 2011 — the worst on record there — destroyed agriculture, causing many farm families to migrate to cities. The influx added to social stresses already created by refugees pouring in from the war in Iraq, explains Richard Seager, a climate scientist at Columbia University’s Lamont-Doherty Earth Observatory who co-authored the study. The drought also pushed up food prices, aggravating poverty. “We’re not saying the drought caused the war,” Seager said. “We’re saying that added to all the other stressors, it helped kick things over the threshold into open conflict. And a drought of that severity was made much more likely by the ongoing human-driven drying of that region.”

Seager added that the entire Middle East “faces a drier, hotter climate due to climate change. This will stress water resources and agriculture, and will likely further increase risk of conflict.” Global warming is desiccating the region in two ways: higher temperatures that increase evaporation in already parched soils, and weaker winds that bring less rain from the Mediterranean Sea during the wet season (November to April). [Continue reading…]