From the lessons on QM, I got impression that there are some discrete orbitals that emit light when electron drops from one to another. Specific molecules emit light in very narrow bands, therefore. Similarly, electrons can absorb these bands. But, my impression was that not any electron can absorb the light for the same reason: it must be the same orbital because electrons can absorb light only when transit from one orbital to another. That is very puzzling because hardly you can find exactly the same electron in the whole Universe, not to speak to find it at on the way of the photon.
The bands are very narrow but they are not like single points in the continuum of frequencies because molecules have various extra speeds in all directions in addition to electron orbitals. This means that the recepting molecule must have the same extra speed. I consider all of that impossible. Does uncertainty principle come to rescue to reconcile the energy differences? This picture, discrete out - discrete in, also does not explain how does our planet convert visible high frequency photons into many low frequency ones. If you can only send and receive photons of specific energies then all scattering can do is to change the direction of light but we see that dissipation can split one high freq photon into multiple low energy ones. How is all of that possible?