It's important to emphasize that CO2 is important mainly for its role as the primary forcing: the actual temperature swing it would cause by itself is minimal.

It's important to emphasize that CO2 is important mainly for its role as the primary forcing: the actual temperature swing it would cause by itself is minimal. It's the feedbacks that kill us (and which are, unfortunately, quite a bit messier than the very clear humankind-CO2-greenhouse effect connection that exists).