It Was the End of Everything

In the beginning, humanity did not understand what was about to happen. The clouds on the horizon were bright in color that touched every shade of blue. No one wondered what the reason was behind those steel color cumulonimbus; the human being was too busy to stop and look at the sky. The wars continued, the number of victims increased, pollution grew, but the smoke from the chimneys was not mentioned in their end.  Meanwhile, the clouds proceeded undisturbed, spreading death and madness on the right path. It all started (or, more properly, ended) as well.