Confirming (again) the CO2 greenhouse effect - but WUWT doesn't like it

There's a new paper out in Nature, by Daniel Feldman and his colleagues, in which they describe how they've measured the contribution of CO2 to radiative forcing at the surface. The measurements were taken in Alaska and Oklahoma. This is not something that's easy to do. It is not straightforward. There are lots of things that happen in the lower atmosphere and at the surface. The scientists managed to extract the signal of radiative forcing from CO2 from that of other things that affect spectral measurements.