[[That is roughly the same as the energy consumed by mankind in all forms]]
Man isn’t the only source of heat- infact he isn’t even a big player I nthat regard- so yes it is a trivial amount- and the atmosphere- man’s contribution, is 0.0015% not 0.012%- and I highly doubt 50% of the heat escaping earth gets trapped- you seemed to have missed the part about how insignificant the total amount of CO2 is compared to the total atmosphere- only a very tiny fraction of escaping/rising heat is trapped because there simply isn’t enough CO2 to absorb any significant amount- and of that tiny amount trapped- only a tinier amount gets back radiated I n the right direction towards earth- and even then, man is ‘responsible’ for an even tinier fraction of that TOTAL amount of ‘back radiated’ heat because man’s contribution is so insignificantly small as to be near zero-
[[We have added 120ppm to that to reach 400 ppm.]]
Not according to the studies and charts I listed-
That's not what I assumed. I assumed only 2% gets trapped. It is a physical constant that 50% is sent back to earth. It is just a hair less due to the curvature of the earth, maybe 49.9%
there simply isn’t enough CO2 to absorb any significant amount
There are enough CO2 molecules to intercept every outgoing IR photon with the right wavelength in 50 meters: http://www.globalwarmingskeptics.info/attachment.php?aid=250 That is the major reasons that skeptics like Nahle point out that CO2 is saturated and adding more CO2 has a diminishing effect.
[[We have added 120ppm to that to reach 400 ppm.]]
Not according to the studies and charts I listed-
Here's an analysis from the 80's: http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2486.1995.tb00008.x/abstract:
Emissions of fossil carbon during the 1980s averaged 5.5 Gt y−1. During the same period, the atmosphere gained 3.2 Gt C y−1 and the oceans are believed to have absorbed 2.0 Gt C y−1. The regrowing forests of the Northern Hemisphere may have absorbed 0.5 Gt C y−1 during this period. Meanwhile, tropical deforestation is thought to have released an average 1.6 Gt C y−1 over the 1980s. While the fluxes among the four pools should balance, the average 198Ds values lead to a ‘missing sink’ of 1.4 Gt C y−1
It is well understood that man's output is responsible for the atmospheric growth. The only remaining question and uncertainty is why there isn't more CO2 in the atmosphere. The ocean absorbs a lot, the forests absorb about 1/4 of what the oceans absorb, but there is an almost equal amount as the oceans absorb that just disappears.
But the fact that man is the cause of all of the increase in the atmosphere and all of the ocean's absorption is not in question. If you have a specific science link or paper that says otherwise please post it.