________ is (are) a source of chlorofluorocarbons.
A) Human-produced chemicals
B) Air conditioning
C) Manufacture of plastics
D) Aerosol sprays
E) all of the above

Question

Quizplus · Accepted Answer

All of the above choices are sources of chlorofluorocarbons (CFCs). Human-produced chemicals, such as refrigerants and solvents, are a major source of CFCs. Air conditioning systems often contain CFCs as refrigerants. The manufacture of plastics can also involve the use of CFCs. Additionally, aerosol sprays have traditionally used CFCs as propellants.

________ Is (Are) a Source of Chlorofluorocarbons