“... found that in fact the trend in the airborne fraction since 1850 has only been 0.7 ± 1.4% per decade, which is essentially zero.”
With that error, the range is -0.7 to 2.1 %. (Could be up - could be down!). Also, water vapor is a much stronger component to the greenhouse effect. Something like 2 to 3x “better” than CO2. So, that 0.7% CO2 only adds something like 0.2% to the greenhouse EFFECT. But hey, if we can cripple our economy to get that 0.2% down by 25% (to say, 0.15%) - I guess that’s a good thing.
Absolutely true, if you’re a commie.