User blog comment:Gundam Legilis/Dust makes the world go round/@comment-24260323-20140824234609/@comment-24.31.13.227-20140825000758

It's probably all been replaced by Dust. Our kind of combustion engine, at least, does not exist since that needs fuel. And hydroelectric power is probably unnecessary if they have enough dust. Though they do have engines of some sort, though.