Mario J. Molina Biography

Mario J. Molina is the Professor of Environmental Sciences in MIT's Department of Earth Atmospheric and Planetary Sciences. Professor Molina's work led to the first definitive demonstration of a truly global environmental effect of human activities-the chlorofluorocarbon-ozone depletion theory first presented in 1974. He was the principal author of the paper describing this theory. Dr. Molina was also principal author or co-author on a meritorious series of papers from 1976-86 that defined and refined the relevant kinetics of the compounds that act as temporary reservoirs for the free radicals responsible for catalytic ozone destruction. More recently he demonstrated in the laboratory a fundamental new chemical reaction whereby the reservoir compounds ClONO2 and HC1 can decompose on the surface of ice cloud particles in the polar stratosphere yielding Cl2 and thus Cl and ClO. Equally important he proposed and demonstrated experimentally a new reaction sequence involving formation and decomposition of ClOOCl which enables the above ClO in polar regions to catalytically destroy ozone. This contribution of a new chemical reaction and a new catalytic cycle appears to account for most if not all of the observed ozone destruction in the Antarctic Ozone Hole.

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