CO2 is a component of atmospheric heat retention in a sum total of causes. That component has a particular value.
" In fact, there is some data that says it is "global warming" that causes the increase in CO2."
There is none. Heat retention does not cause increases in atmospheric CO2. It causes decreases.
An increase in ocean temperature decreases the solubility of CO2 in the oceans, increasing the concentration of CO2 in the atmosphere. A decrease in ocean temperature increases the solubility of CO2 in the oceans, decreasing the concentration of CO2 in the atmosphere. This is exactly why a shaken hot beer foams a lot more than a shaken cold beer when you open it.
The oceans have been known as a global CO2 sink for a long time.
Not so. Recently there was an article posted that looked at Vostok ice core temperature and atmospheric CO2 concentrations and related their correlation to temperature dependence of CO2's solubility in water. As water temperatures increase, it accepts less CO2.
Wrong. See a previous post on the effect of temperature on the solubility of CO2 in water. This is ONE such effect. I'm sure there are others, probably some yet to be discovered. The atmosphere and the geo- and bio-chemical cycles governing its composition are VERY complex.
The point is that we simply do NOT have sufficient data on causes or effects to take drastic action. The CORRECT thing to do at this point in time is to keep studying the complex cycles, taking better measurements, and building better models--using REAL open science instead of the current politicized IPCC stuff.