Telegraph:

THE green movement’s greatest triumph – the abolition of ozone-destroying CFC gases in the 1980s — may become its biggest embarrassment because of research showing that their replacements are sharply accelerating global warming.
CFC, or chlorofluorocarbon, gases were widely deployed in air-conditioning and refrigeration units before they were found to destroy the ozone layer and banned under the 1987 Montreal protocol.
They were replaced by HFCs — hydrofluorocarbons — gases that have far less effect on ozone but have since been revealed as extremely powerful greenhouse gases.
A ton of HFC23 used in refrigeration has the same global warming potential as 14,800 tons of CO2. A ton of HFC-134a, widely used in vehicle air-conditioning units, is equivalent to 1,430 tons of CO2. The problem has been increased by the rising demand for refrigeration and air-conditioning because of economic expansion and population growth in Asia.