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4. In the 1900s, automobile manufacturers were mandated to switch from
R12 refrigerant to R134a for use in air conditioning. It was found that when
R12 leaked from a defective air conditioner, it would react with molecules
of ozone and change them to molecules of oxygen. Why would the use of
R12 refrigerant be harmful for the environment? *

A. The use of R12 refrigerant increases oxygen concentrations in the atmosphere,
leading to accelerated plant growth

B. The use of R12 refrigerant decreases ozone concentrations in the atmosphere,
leading to more exposure of UV radiation

C. The use of R12 refrigerant increases the amount of carbon dioxide in the atmosphere,
leading to a decrease of global temperatures

D. The use of R12 refrigerant decreases the level of oxygen in the atmosphere, leading to
higher than normal hurricane activity