Galactic cosmic rays have been positively correlated to the Earth’s low cloud cover. It is now evident that cosmic ray ionization is linked to lowering nucleation barriers and promoting early charged particle growth into the Aitken range. There is a substantially high probability that some of the charged particles grow to the 100 nm range and beyond to become CCN. There is also evidence that electrically charged aerosol are more efficiently scavenged by cloud droplets, some of which evaporate producing evaporation aerosol, which are very effective ice formation nuclei.