It does a reasonable estimate of the direct effect of CO2 and as you are probably aware this figure is 0.8 to 1.2 deg C for a doubling of CO2.
Yes, I am aware that this is the temperature change that a doubling of CO2 would have in a scenario with no feedbacks- a blackbody.
It is likely that there are negative feedbacks that act to supress the warming even further.
You are a bit confused here cell phones generate heat due to potential energy being released in to the cell phone circuits. All objects that are above 0 Deg K radiate and absorb radiation, an equilibrium is reached with its neighbours, when the radiation in is in balance with the radiation out.
You missed my point.
The point is, just because that we know something impacts the surroundings, does not mean it is a large factor by any means.
This is quite correct but unfortunately the minor effect of CO2 causing 3 or 4 deg C increase in temperature is going to be a major problem for nearly all life on earth.
I still can not believe how some people can believe sensitivities that high.
In order to believe a 4 Degree sensitivity, you would have to believe that the increase in CO2 has caused a 1.6 Degree C temperature change over the 20th Century, which we haven't even come close to.
You would then need to prove that something is so strong that it would create a cooling of 0.8-0.9 Degrees C to give us the 0.7-0.8 Degrees C of warming we have observed during the 20th Century.
If it were aerosoles, we would see the Northern Hemisphere warming the slowest, and the cities would be seeing enormous temperature drops to get the global value of nearly 1 Degree C cooling, since the impacts of aerosoles are short lived and very local.
We don't see either of these.
You can argue as much as you like but the people who thoroughly understand the science say you are wrong.
There are many people who are skeptical who would argue that you were mistaken yourself.