Paul Mayewski, director of the University of Maine Climate Change Institute, is participating in a “Maine Calling” discussion about how the “dramatic, irreversible changes” in the Arctic will influence geopolitics at 11 a.m. and again at 7 p.m. Tuesday, Feb. 16.  Other participants in the upcoming discussion include Frances Ulmer, former chair of the U.S. Arctic Research read more Mayewski, Miller to join ‘Maine Calling’ programs about Arctic geopolitics, ethics of vaccination