A 1980s ban on CFCs to heal the ozone layer is also shaving degrees off global warming, study says

The world would be on track for a collapse of the ozone layer and an additional 2.5 degrees Celsius of global warming by the end of the century if it hadn't agreed in the 1980s to ban CFCs, chemicals once commonly used in aerosol sprays, refrigeration and air conditioners, according to a new study.