The ecosystem of our world is a closed system: it would run out of gas, collapse of its own weight.
Joan D. VingeBut what force in the galaxy is stronger than she is?" "Indifference." Jerusha surprised herself with the answer. "Indifference, Gundhalinu, is the strongest force in the universe. It makes everything it touches meaningless. Love and hate don't stand a chance against it. It lets neglect and decay and monstrous injustice go unchecked. It doesn't act, it allows. And that's what gives it so much power.
Joan D. VingeThere's more to me, more to the universe, than I suspected. Room for all the dreams I ever had, and all the nightmares...heroes in the gutters and in the mirror; saints in the frozen wasteland; fools and liars on the throne of wisdom, and hands reaching out in hunger that will never be filled.
Joan D. Vinge