yeah, it expands when it freezes, but it also expands when it is heated (which is why you need a pressurized expansion tank on a water heater system). That said, however, I've never heard figures about the ocean rise due to expansion of the water and am skeptical that it would amount to much.
The fact about all this though, is that we can do something about the filth we put into the atmosphere. Cheap? Not necessarily but neither is trying to figure out how to live on the moon (that was sarcasm).
If fuel efficient cars aren't selling, why are the Honda and Toyota companies continuing to grow and post considerable profits? The big automakers openly admit that they missed the ball and simply don't have attractive fuel efficient cars available.