Paul S, the so-called airborn fraction is decreasing, while the consensus predicted increasing (another one bites the dust). I predict further decline if the cooling really kicks in. Human emissions are almost irrelevant, because the increased atmospheric CO2 partial pressure will cause uptake by oceans/water.
http://www.esrl.noaa.gov/gmd/webdata/ccgg/trends/co2_data_mlo_anngr.pdf
http://csironewsblog.files.wordpress.com/2011/12/gcp-2010-proof-nature-climate-change1.pdf
By the way, what do you think causes the seasonal CO2 cycle, SST cycle or NH greening?
