What is evident (thanks to ice cores) is each time the earth warms its way out of an ice age it is because of an increase of CO2 in the atmosphere. Except, the concentration of CO2 presently in the atmosphere has never been higher in earth's history. This means that there won't be just minor disruptions in the lives of humanity but catastrophic climatic results. But these events probably won't happen in our lifetimes but will be left to future generations to deal with. Frankly, I'm glad I won't be around to see it happen.