Ken Macleod:
“Global warming is real, it’s happening and it’s serious, but it’s certainly no reason to believe there’s more than an outlying possibility of the world coming to an end in this century.”
Charles Stross:
I’ve lately been trying to project possible futures that don’t include any kind of singularity, be it a minor one (like the steam engine) or a massive one (strongly superhuman A.I.s that are to us as we are to cats and dogs). Mostly they require either a malthusian collapse, or repressive legislative/political forces. So, to that extent, any SF that doesn’t try to address the issue is either a dystopia or a fantasy.