Safeguarding the ozone layer and the global climate system

After 20 years of protecting the ozone layer with a new generation of chemicals, governments are confronting the fact that these ozone-friendly substitutes for chlorofluorocarbons (CFCs) also happen to be greenhouse gases that contribute to global warming. Taken together, the various solutions identified by the report could cut the global warming contribution of CFCs and their replacements in half by the year 2015.