The Montreal Protocol on Substances that Deplete the Ozone Layer requires periodic assessments of available scientific, environmental, technical and economic information. This 1998 Assessment focuses on the following areas: changes in biologically active ultraviolet radiation reaching the Earth's surface and the effects of increased solar ultraviolet radiation on terrestrial ecosystems, materials and biogeochemical cycles. This latest report, which can be read without reference to earlier editions, contains a new section on frequently asked questions. Book Ordering Information: Sales Number:E. 99.III.D.93 ISBN: 92-807-1724-3 Pages: 209pp. Price: $45.00 
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