Is the airborne fraction of anthropogenic CO2 emissions increasing?
Geophysical Research Letters:
It is shown that with those uncertainties, the trend in the airborne fraction [of C02] since 1850 has been 0.7 1.4% per decade, i.e. close to and not significantly different from zero.
I must be missing something, I thought the airborne concentration of C02 in the atmosphere was rising???