It is my unserstanding, having watched a lot of video's on the subject from different sources, that CO2 does infact rise when there is warming, but the cart is being placed firmly before the horse. The global warming hypothesis suggests that a rise in CO2 causes a rise in temperature, however, the evidence put forward in several videos suggests that the rise in temperature occurs first, causing the oceans to warm and release dissolved CO2 into the atmosphere. The temperature rise could be caused by any number of factors, not just CO2.