A new study reveals a concerning uptrend in the emissions of five ozone-depleting substances from 2010 to 2020, despite their production for most applications being prohibited by the Montreal Protocol. The release of these five chlorofluorocarbons (CFCs) partially stems from leakage during the produ
No immediate threat to the ozone layer – but a significant greenhouse effect
CFCs are chemicals known to destroy Earth’s protective ozone layer. Once widely used in the manufacture of hundreds of products including aerosol sprays, as blowing agents for foams and packing materials, as solvents and refrigerants, CFC production for such uses was banned under the Montreal Protocol in 2010.
However, the international treaty didn’t ban the use and creation of CFCs during production of other chemicals including hydrofluorocarbons and, more recently, also hydrofluoroolefins , which were both developed as replacements for CFCs. The researchers determined that for three CFCs they studied – CFC-113a, CFC-114a, and CFC-115 – the increased emissions may be due in part to their role during the production of two common HFCs used primarily in refrigeration and air conditioning.
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