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Letter

Nature Geoscience 2, 333–336 (1 May 2009) | doi:10.1038/ngeo499

Inadvertent climate modification due to anthropogenic lead

Daniel J. Cziczo , Olaf Stetzer , Annette Worringen , Martin Ebert , Stephan Weinbruch , Michael Kamphus , Stephane J. Gallavardin , Joachim Curtius , Stephan Borrmann , Karl D. Froyd , Stephan Mertes , Ottmar M|[ouml]|hler & Ulrike Lohmann

Aerosol particles can interact with water vapour in the atmosphere, facilitating the condensation of water and the formation of clouds. At temperatures below 273|[thinsp]|K, a fraction of atmospheric particles act as sites for ice-crystal formation.