tis the warming causing the CO2, not the CO2 causing the warming....
If there was no man around the warming from the ending of the Little Ice Age would have added about 5-10 ppm of CO2 to the atmosphere (basically by warming the oceans about 1C). Instead we have seen more than 100 ppm rise. The ocean now absorbs net CO2, doesn't release it (net). The only scientific question is whether the land sinks will grow (probably) and those and the ocean will continue to damp the human-made CO2 rise.