As I keep agreeing, all these bits of evidence are very credible but, being essentially circumstantial, cannot and should not be regarded as proven truths - particularly given the complexity of the situations we are talking about.There is quite clear evidence of a massive spike in global CO2 levels following the industrial revolution. This can be shown to be not the result of volcanic activity or any other natural phenomenon, thereby attributable to man (and woman)
In terms of my comments to which you were responding, there would be bound to be 'spikes' of atmospheric CO2 levels after a sudden increase in CO2 injection into the atmosphere, since some of the natural 'regulatory processes' (particularly the geological one) can take quite a time to catch up. There have, of course, been plenty of 'spikes' (and cyclical changes) in atmospheric CO2 long before industrialisation was a factor, and in many cases we can be far from certain that we fully understand the 'natural phenomenon/phenomena' (quite possibly a mix of them) which brought about these changes.
Kind Regards, John