National Weather Modification Policies and Programs Zero Geoengineering Posted on October 20, 2016 by directorNovember 25, 2017 National Weather Modification Policies and ProgramsNovember 1979Link to PDF document Share this: Share on Facebook (Opens in new window) Facebook Share on X (Opens in new window) X Share on Tumblr (Opens in new window) Tumblr Share on Reddit (Opens in new window) Reddit Email a link to a friend (Opens in new window) Email Related