The magnitude of the effect seems quite out of proportion to the almost trivial source which they found at the quantum level. Apparently in the dumbbell shaped CO2 molecule the oxygen atoms (ions?) can shake wobble and roll around the Carbon atom allowing it to absorb heat at slightly different wavelengths than its natural wavelength. Like just a little bit. But that’s enough to heat up the whole planet.
Anyway it’s surprising. If we could figure out how to get the CO2 to cool it on the quantum level we might not have this problem. We need a quantum refrigerator.