Stephen O. Andersen protecting the stratospheric ozone layer. At EPA he rose to Deputy Director for Stratospheric Ozone Protection and then transferred to the Climate Protection Partnerships Division, where he was Director of Strategic Climate Projects until his retirement from government in 2009. The timing of Andersen’s arrival at EPA was fortuitous. 1987 proved to be a watershed moment in the effort to stop ozone depletion, which increased risks of skin cancer and threatened to wipe out crops and ecosystems, among many adverse impacts. The Montreal Protocol on Substances that Deplete the Ozone Layer was agreed on 16 September 1987 and created a
Radium, and other radioactive substances Radium, and other radioactive substances Radium, and Other Radio-active Substances; Polonium, Actinium, and Thorium is a book published in 1903 by William Joseph Hammer, when he was about 50 years old. The book is the text of a lecture delivered at a meeting of the American Institute of Electrical Engineers. The title of the lecture was "Radium and other radioactive substances with a consideration of phosphorescent and fluorescent substances. The properties and applications of selenium and the treatment of disease by the ultra violet light". The lecture was augmented by 38 lantern slides, which are reproduced in the book. In