I'll post this just to get it out of my system, lol

So, I have done it elsewhere, and thought I'd try it here.

The basic idea would be that, after we ruined the planet, the general governing body decided it was time to leave. They find an apparently suitable planet, and send some criminals in - if they die, they won't be missed, after all.

The player characters would be said criminals, and the story would follow them as they colonize the land - or die trying. I'll detail further if this gets enough interest.