BNL-75155-2005-BC AEROSOL, CLOUDS, AND CLIMATE CHANGE S. E. Schwartz Environmental Sciences Dept./Atmospheric Sciences Div. Brookhaven National Laboratory Upton, NY 11973-5000 Published in “Nucleation and Atmospheric Aerosols 2004”, M. Kasahara and M. Kulmala, Eds., pp.323-338, Kyoto Univ. Press, 2004. September 2005 Notice: This manuscript has been authored by employees of Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. The publisher by accepting the manuscript for publication acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. This preprint is intended for publication in a journal or proceedings. Since changes may be made before publication, it may not be cited or reproduced without the author’s permission.