Check this video out.
Back in 2011 Arab Spring was caused by global warming. How so? There was a big drought in Russia and China, main producers of wheat. Russia and China closed export of wheat and increased price 700%. That caused dire shortage of wheat in many Arab countries who are big wheat importers and these food shortages escalated into riots.
But, all that is not the most exciting part. The most exciting part is that it was all seen on satellites and warnings about possible social instability were risen by US intelligence.
But right now there are big droughts in South America and criminal gangs like MS-13 are grabbing these resources and forcing people to join them. Practically taking over whole countries.