the addition of 600 billion tons of carbon into our atmosphere has no effect :rofl:
Only about 3% of the CO2 is the result of human activity.
If it was all about CO2 levels then we would have seen a steady temperature rise over the last 200 years or so. We haven't , so clearly and obviously there are other much more powerful factors at work.
We are in fact in a warming environment between ice ages.The global temperatures rise when volcanic activity is reduced and fall when it increases.It's been significantly warmer than at present in the relatively recent past.