A rise in the use of "ozone-friendly" HFCs has prompted experts to voice concerns that the potent greenhouse gases could be a problem in the future.A UN report says that HFCs, many more times potent than CO2, could account for up to 20% of emissions and hamper efforts to curb climate change.
They are widely used in fridges and air conditioning, replacing CFCs and HCFCs that damage the Earth's ozone layer.
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