Question

ozone - depleting chemicals
in the mid - 1900s, ozone - depleting chemicals like cfcs, hcfcs, and halons were widely used worldwide. they were considered revolutionary for applications such as air conditioning and refrigeration.
these compounds, present in appliances and fire extinguishers, had long lifespans. however, as these products aged or were discarded, the chemicals were released into the atmosphere. millions of people unknowingly contributed to this release by repairing or disposing of appliances. the substantial environmental impact led to global initiatives to regulate and reduce ozone - depleting substances.
what is a notable characteristic of cfcs, hcfcs, and halons?
have long lifespans
biodegrade quickly
have short lifespans

Explanation:

The text states that CFCs, HCFCs, and Halons present in appliances and fire - extinguishers had long lifespans.

Answer:

have long lifespans