The Montreal Protocol was designed to protect the stratospheric ozone layer by enabling reductions in the abundance of ozone-depleting substances such as chlorofluorocarbons (CFCs) in the atmosphere. The reduction in the atmospheric concentration of trichlorofluoromethane (CFC-11) has made the second-largest contribution to the decline in the total atmospheric concentration of ozone-depleting chlorine since the 1990s.
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/unexpected-and-persistent-increase-global-emissions-ozone-depleting-cfc-11
[2] http://admin.indiaenvironmentportal.org.in/category/author/stephen-montzka
[3] http://admin.indiaenvironmentportal.org.in/category/author/geoff-s-dutton
[4] http://admin.indiaenvironmentportal.org.in/category/author/pengfei-yu-et-al
[5] http://admin.indiaenvironmentportal.org.in/category/journal/nature
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/cfcs
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/montreal-protocol
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ozone-layer
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/atmosphere-and-ozone-layer