Thanks for admiting that CO2 warms the earth.
According to the folks who seem to know about this stuff, CO2 is a GHG and therefore by definition, does not actually warm the planet, but does prevent warmth from escaping into space.
It is not an arithmetic increase of effectiveness, though. For every degree of warming caused by a given amount of CO2, adding that same amount of warming incrementally requires twice the amount of CO2.
So, If you would believe the AGW crowd, the amount of CO2 in the air right now has caused the planet to be more than 30 degrees warmer than than if there was no CO2 in the air.
The argument goes that a little CO2 caused a given amount of warming and allot of CO2 will cause allot. However, that's not the whole story if we lay the warmiong at the foot of CO2. The first degree of warmikng required a certain amount. The second degree required twice that amount and so on. We all know the stories of the peasant who is rewarded by the king with a grain of wheat on the condition that he gets a doubled amount of the previous days wheat every day for the remainder of his life and soon the entire wheat crop of the kngdom is his.
This is the same with CO2. How much CO2 will be required at this point to raise the Global climate by one degree? If the AGW theory is correct, a level of 560 ppm will do the trick. The next degree will require a level of 1160 ppm. The next degree will be hit with a level of 2320 ppm. The next degree will see birds falling out of the air and humans passing out from oxygen deprivation, not heat stroke.
Can the CO2 concentration rise to this level? It has before, but that was millions of years ago. The simple truth, though, is that the global climate has been that warm within the last 120 thousand years and CO2 was nowhere near that level. Why? Beause CO2 concentration does not cause claimate change, it reacts to it.
At the end of the previous interglacial, without the benefit of CO2 levels this high, temperature was two degrees higher than today.
If temperature was dramatically higher and CO2 was dramatically lower, what may we gleen from this in terms of the global climate and its relation to CO2?