http://motherboard.vice.com/blog/a-complex-systems-model-predicted-the-revolutions-sweeping-the-globe-right
Correlation isn't proof by itself but it is suggestive. Sad that a serious topic like this gets relegated to the fringe media like Vice.com but such are our times.
There is growing fear about the drought in California and the huge effect it may have on food prices.
People have to eat and if they can't afford or find the food they want, they get aggetated and start blaming others.
There will be back lashes in US if the drought in california continues. Stock up now is my advice.