The last survivor

The world as we knew it ended in the year 2087. It wasn't a sudden event, but rather a gradual decline. The environment was deteriorating, and the weather patterns were becoming more and more extreme. The governments of the world were too busy fighting each other to pay attention to the warning signs.

By the time they realized what was happening, it was too late. The Earth was no longer habitable, and the few remaining humans were forced to flee to space stations orbiting the planet.