Any college freshman chemistry student knows that the solubility of CO2 decreases with increasing temperatures and thus Earth’s oceans will release large amounts of CO2 to the atmosphere when the water is warmer and will absorb more CO2 when the water is colder. That is why the CO2 level during the ice ages was so much lower than the levels today. That doesn’t take away the fact that we are artificially raising the atmospheric CO2 levels, but just because we do, that doesn’t mean that this will cause temperatures to increase in any significant way. The 40-year cooling period between 1940 and 1980 appear to support that premise. What we can conclude is that the ice ages were not caused by changes in the atmospheric CO2 levels and that other stronger factors were involved with these very large climate changes.
Students who graduate in Environmental Science apparently don't have to take and pass basic Chemistry their freshman year.