Why are sea levels rising?
First off, you do know that floating ice has no effect on sea levels when it melts? Therefore, all the polar ice in the Arctic could melt, and it wouldn't effect sea levels.
Antarctic ice sheets have been melting since the last ice age thousands of years ago. It has nothing to do with CO2, or because anything man is doing or not doing.
Also, sometimes the sea levels lower for decades. When the ocean warms, there is more evaporation, which causes more rain and snow in the polar regions, which means water is transferred from the ocean to polar caps, glaciers, etc.
Antarctica is land, and has been gaining ice.
Sea levels are measured with satellites, and have only been done since the early 1990's. There is no way to come up with any kind of substantial conclusions in such a short time.
All your theories are based on hypothetical models, not facts.