In descending order, which of the below shows the correct order of the potential for ozone depletion from these current or former refrigerants?
Explanation
Answer: A -Chlorofluorocarbons (CFCs) contributed greatly to ozone layer depletion. They were replaced as refrigerants by hydrochlorofluorocarbons (HCFCs), which cut the ozone depletion by 95%, and which are now being supplanted by hydrofluorocarbons (HFCs), which do not contribute at all to ozone depletion. However, HFCs play a substantial role in contributions to global warming, so they themselves are slated for eventual phasing-out.
