FILE - In this Thursday, July 30, 2015 file photo, air conditioners and power generators are displayed on a street in central Baghdad, Iraq. Nations reached a deal Saturday, Oct. 15, 2016 to limit the use of hydrofluorocarbons, or HFCs - greenhouse gases far more powerful than carbon dioxide that are used in air conditioners and refrigerators, in a major effort to fight climate change. (AP Photo/ Khalid Mohammed, File)