If any part of the spaceship is poisoned, then all suffer — which is to say that the extinction of the rain forest is not a Brazilian problem; the pollution of the oceans is not a Miami problem; the depletion of the ozone layer is not an Australian problem. It follows from this, of course, that genocide is not a Bosnian problem, hunger not a Somalian problem, political oppression not a Chinese problem. "Never send to know for whom the bell tolls," wrote John Donne. "it tolls for thee." If ever there was a narrative to animate that idea, the Earth as our one and only spaceship is it.
— Neil Postman, The End of Education