Ozone layer depletion
FILE - In this Feb 25. 2010 file photo, Mexico's Nobel Chemistry Prize laureate Mario Molina gestures during a conference on global warming in Guadalajara, Mexico. Molina has died on Wednesday, October 7, 2020, his family informed. (AP Photo/Carlos Jasso, File)
Mario Molina, Mexico chemistry Nobel winner, dies at 77

Oct. 07, 2020 08:06 PM EDT