Somehow, humanity has still managed to survive, and they live in big floating cities, which, for some reason, remind me of space stations.
Modern technology is practically nil.
The scene opens with a rather inexplicable and pointless scene. There's a guy on his boat, out on the open ocean. He urinates into some gizmo that changes it into water. He gets attacked by some random guys, and they steal his potted plant. So Guy heads to the nearest floating city and uses some dirt to buy a new plant.