Ralph J. Cicerone, scientist who worked to protect the ozone layer, dies at 73

Dr. Cicerone was president of the National Academy of Sciences.
Read more: https://www.washingtonpost.com/local/obituaries/ralph-j-cicerone-scientist-who-worked-to-protect-the-ozone-layer-dies-at-73/2016/11/06/2b2ec0aa-a427-11e6-8fc0-7be8f848c492_story.html?source=Snapzu