National Science Environment International Leaders To Discuss Substances That Cause Global Warming 5:46pm October 30, 2015 U.S. Science Environment Share URL copied to clipboard! Copyright 2015 NPR. To see more, visit http://www.npr.org/. 300x250 Ad More All Things Considered National 'Marfa for Beginners' podcast welcomes you to the art town National A conversation with the Derby's 1st Black trainer in over 30 years 300x250 Ad Support quality journalism, like the story above, with your gift right now. Donate