Yes, there has been a rather small increase in measured atmospheric CO2. Another thought, CO2 is rather water soluble and the immense amount of water in the oceans is by no means saturated. So the small increase in atmospheric CO2 should scrub out with rainfall into ocean waters in relatively short time. This would make any long term predictions worthless.
Actually, methane is much more significant to global warming, and isn't as easily removed. Living organisms contribute a large amount of this gas.