People laugh when I say the origins of ISIS can be tied to climate change but the Arab Spring started with an unusual wheat drought that destabilized the whole region.
Drought hit Syria in 2007-2008, forcing farmers into cities, destabilizing the country, leading to civil war and mass emigration to Europe. Drought hit El Salvador, Guatemala and Honduras from 2014-2018 and the rural economy collapsed, leading to mass migration to the United States. There will be more and larger mass migrations, as manmade global warming leads to more deserts and more war. This is why the Pentagon takes climate change seriously as a National Security threat.