It seems to me that the CO2 problem is one of how much CO2 can be "recycled" each year (by natural processes) vs how much is dumped into the atmosphere, by natural and manmade processes. If the two are in balance, it is a stable situation. If there is more CO2 produced than can be recycled, warming will occur and a positive feedback loop established. It appears that more is being dumped into the atmosphere than can be recycled.

Here is a link to a short (about 6 min.) September 2014 You Tube video that discusses several of the global warming/climate change issues. Note that in the video description, sources for its statements are cited.

https://www.youtube.com/watch?v=OWXoRSIxyIU