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Three of the CFCs identified in the new study are ingredients or byproducts in the production of ozone-friendly chemicals that were invented to replace CFCs.

Industry marketed the alternatives as ozone-friendly, an early example of green marketing.

As it happened, the ozone-friendly replacements for the CFCs, known as hydrofluorocarbons, turned out to be distinctly unfriendly to the climate.

HFCs are ozone-friendly replacements for CFCs and are often used as refrigerants.

Since the late 80s, the most harmful coolants have steadily been switched out for more ozone-friendly options, and the EPA is planning to phase out all ozone-depleting substances by 2030.