When one can explain why ice ages begin and end I will be willing to debate global warming. It is actually due to orbital mechanics. Oddly the natural state of planet earth is ice age over the most recent millions of years. Currently we enjoy the warmth which if brief.
PS
CO2 is plant food. When great creatures roamed the earth in the past it was a function of CO2. It was much higher and thus plants flourished. Herbivores flourished as did the carnivores that ate them.
Great points. When CO2 levels were at their highest during the Carboniferous period, plants and animals exploded in variety and size.