1. Albrecht, B. A. Aerosols, cloud microphysics, and fractional cloudiness. Science 245, 1227–1230 (1989).
2. Twomey, S. The influence of pollution on the shortwave albedo of clouds. J. Atmos. Sci. 34, 1149–1152 (1977).
3. Ramaswamy V. et al. in Climate Change 2001: The Scientific Basis 349–416 (eds Houghton, J. T. et al.) Ch. 6, 349–416 (Cambridge University Press, New York; Pacific Northwest National Laboratory (PNNL), Richland, WA, 2001).
4. Boucher, O. et al. in Climate Change 2013: The Physical Science Basis. Contribution of Working Group I to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change (eds Stocker, T.F. et al.) Ch. 7, 571–658 (Cambridge University Press, 2013).
5. Stevens, B. & Feingold, G. Untangling aerosol effects on clouds and precipitation in a buffered system. Nature 461, 607–613 (2009).