Secretary of State John Kerry delivers a speech to the 28th Meeting of the Parties to the Montreal Protocol on Substances that Deplete the Ozone Layer, in Kigali, Rwanda, Friday, Oct. 14, 2016.  The group of nations gathered in Kigali, are striving Friday for a deal to phase out hydrofluorocarbons from air conditioners and refrigerators as part of efforts to fight climate change. (AP Photo)