It starts as just a spot of seeming mold on the old broken deck chair shoved in the corner of the garage. Were it something so simple, there would be no cause for alarm, but no one bothered to look closely. No one had any idea what lay in the small green blemish until it was too late, far too late.
It continues as a patch of rust on a bike that hasn't moved in years. Long outgrown and abandoned it leans against the deck chair as if for support in its old age. The scab of sand coloured dryness eats in, spreads out, hungry and impatient. No one notices as it devours the bike they've forgotten. They'll wish they had remembered.
It ends in the seemingly harmless puddle of water. It collects on an old warped window sash at the back of the little used garage. Within easy dripping distance of the chair and the bike, and it is this last simple thing, a drop of water, that gives rise to the end of the world as we know it.
The mold is nothing so simple, but is actually a viscous, teaming rainforest in miniature. The rust is a desert so parched, so deadly that it renders even metal into dust. The puddle of water is the ocean, the rain, the flood. And here in this forgotten space where no one notices them, they cease being quite so small. The trees grow, the sand blows, and the water flows. First the garage is lost. By the time anyone notices, the house is gone. Before anyone takes action the block has been devoured. Before they find an effective weapon the state is gone. Before humanity can manage to unite against these most unnatural of natures invaders, the planet is lost. Or perhaps it has finally been won.