We are continually redesigning 'spaceship earth'

The metaphor of the earth as a spaceship or life-­support system, is quite perverse. . . . To the extent that we are on a ‘spaceship,’ we have never merely been its passengers, nor (as is often said) its stewards, nor even its maintenance crew: we are its designers and builders. Before the designs created by humans, it was not a vehicle, but only a heap of dangerous raw materials