It's pointless to achieve a red Mars by pouring blood over the planet. We have to find another way. We can't do it by killing people. Not even by killing animals or plants, or blowing up machines. It won't work. It's destructive. It doesn't appeal to people, do you understand? No one is won over. In fact they're put off. The more we do things like that, the more green they become. So we defeat our purpose. If we know that and do it anyway, then we're betraying the purpose. Do you understand? We aren't doing it for anything but our own feelings. Because we're angry. Or for thrills. We have to find another way.

- from Blue Mars by Kim Stanley Robinson