It turns out that common chemical coolants actually lead to ozone depletion.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/ozone-depletion-may-be-caused-common-chemical-coolants
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/science-world-report
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/atmosphere-and-ozone-layer
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ozone-layer
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/global-warming
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ozone-hole