What is the premise? The premise is excess CO2 & other greenhouse gases in the atmosphere trap infrared heat radiation preventing infrared radiation from it's natural path out of Earth atmosphere and into space. This infrared heat radiation is absorbed by greenhouse gases in the atmosphere +

This infrared heat radiation is absorbed by greenhouse gases in the atmosphere which heats up ambient air and this hot ambient air which is in contact with the ocean surface transfers its heat to ocean waters & so both air & water are heated up by this obstructed infrared radiation. +