Back in the 1980s, substances such as chlorofluorocarbons, or CFCs, which were used in everything from hairspray to refrigerators, were singled out as major causes of ozone depletion.
After the introduction of the Montreal Protocol, these ozone-depleting substances were phased out and replaced with substances deemed safer for the ozone — including hydrofluorocarbons, or HFCs.
Fast-forward 20 years. The ozone problem has largely faded to the back burner, but now we’re faced with a potentially larger environmental problem as we learn more and more about global warming. And guess what? HFCs happen to be tens of thousands of times more potent as greenhouse gases than carbon dioxide.
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