Hydrofluorocarbons (HFCs) are excellent alternatives for use in refrigerators and industrial air conditioners. But while they do not deplete stratospheric ozone, they are extremely powerful greenhouse gases with a high global warming potential. Globally, HFC emissions are currently growing at a rate of 8 per cent per year. The use of HFCs could potentially wipe out all the climate benefits gained through phasing out CFCs and other ozone-depleting substances.