One paper does not overturn thousands of papers using very different methods to show an anthropogenic climate change effect. The study needs to be redone and verified by other climate labs, which if this is accurate they will be rushing to do.
Even if this is correct, it only reverses one small part of the evidence. CO2 and historic temperatures remain correlated. Other runaway effects still exist (ice melt -> lower albedo -> less reflection -> more warming). It will take a lot more evidence to 'debunk' this.
And yeah as said; climate change theory is a lot more than "more CO2 -> more warming".
If I was to start criticising the paper, I would say that since they only measured during a solar storm (a rare and intense event), they can't just extrapolate to all radiation over all time periods with no reasoning.
