The point was simple: Sea water absorbs more energy from the sun than it reflects back into the air. Land, on the other hand, reflects more back into the air.
Moving on to the next step. Whatever solar radiation is reflected back into the atmosphere is transformed at the earth's surface first into different wave lengths include infrared. It is the IR that whatever free CO2 holds as heat.
http://genchem.rutgers.edu/CO2glwarm.html
Because sea water absorbs most of the solar radiation that reaches the sea surface there is less that reflects back. Thus, sea air is cooler, having less energy.
http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/fw/sea/htg.rxml
You and boygeorgia scoffed at that and claimed, falsely, just the opposite.
I also pointed out if sea water temps are rising, it is because it is getting more sun. The air doesn't warm the sea.