2083-2084: The Long Winter
Because of the Flare, society was torn apart. Long range communications became nearly impossible, so the governments all around the world couldn't coordinate an appropriate response to the crisis. The supply chains broke down, so city-dwellers starved and quickly grew desperate. Parents sold their children for a loaf of moldy bread. Others resorted to violence to increase their chance of surviving just one more day. Un-controlled forest fires covered the skies in ash for years. Acid rains killed most crops.
Civilization is reduced to thousands of small groups of just a few dozen survivors, barely aware of anything happening beyond the walls of their camps.