distant mountains
dark clouds
Weather spread the lichen
While the people in Nairobi coughed and wheezed, one downwind government mistook Black Rain for biological warfare, and attacked its neighbors with missiles and malware. The military giants quickly crushed these fools.
Wherever Black Rain fell, everyone died. The dead zones grew, irrefutably. Forecasts grew evermore grim.
Some people just gave up, and embraced hedonism or suicide, but most of you pulled together, as humanity never had before.