Jason Blake Cohen will present a public seminar as a part of his Doctoral Dissertation Defense in the Dept. of Earth, Atmospheric and Planetary Sciences. His thesis is entitled: Urban-Scale Impacts on the Global-Scale Composition and Climate Effects of Anthropogenic Aerosols. The Chair of the Defense is Prof. Ronald Prinn, and the members of the Thesis Committee are: Alan Plumb, Chien Wang, and Phil Rasch (PNNL). Copies of the thesis may be obtained from the EAPS education office 54-912. All interested faculty, staff and students are invited to attend.