1) Doomsday scenario 
Ecophagy is a term coined by Robert Freitas that means the literal consumption of an ecosystem. It derives from the Greek `οικος` (oikos) or Late Latin `oeco-`, which refers to a `house` or `household`, and Greek φᾰγεῖν phagein `to eat` Freitas used the term to describe a scenario involving molecular nanotechnology gone awry...