Glaciation of liquid clouds, snowfall and reduced cloud cover at industrial aerosol hot spots -н Toll, V, Rahu, J, Keernik, H, Trofimov, H, Voormansik, T, Manshausen, P, Hung, E, Michelson, D, Christensen, M, Post, P, Junninen, H, Murray, BJ, Lohmann, U, Watson-Parris, D, Stier, P, Donaldson, N, Storelvmo, T, Kulmala, M, Bellouin, N