What is the lifetime range of CFCs?

What is the lifetime range of CFCs?

• A. 1-10 years
• B. 10-20 years
• C. 20-100 years
• D. 100-200 years

Answer: (C)

The lifetime range of chlorofluorocarbons (CFCs) is between 20 to 100 years. This lengthy lifespan is a significant concern regarding their environmental impact, especially concerning ozone depletion. CFCs are stable in the lower atmosphere, meaning they do not break down easily and can persist for decades. Once they reach the stratosphere, they are exposed to ultraviolet (UV) radiation, which initiates their breakdown, releasing chlorine atoms that contribute to the depletion of the ozone layer. The long atmospheric persistence of CFCs means that their effects can be felt for many years after their use has been curtailed or eliminated, underscoring the importance of regulations like the Montreal Protocol aimed at phasing out these substances. This understanding of CFC lifetimes highlights the need for careful consideration of substances that can remain harmful in the environment for an extended period, influencing policies and practices surrounding chemicals in refrigeration and other applications.

The lifetime range of chlorofluorocarbons (CFCs) is between 20 to 100 years. This lengthy lifespan is a significant concern regarding their environmental impact, especially concerning ozone depletion. CFCs are stable in the lower atmosphere, meaning they do not break down easily and can persist for decades.

Once they reach the stratosphere, they are exposed to ultraviolet (UV) radiation, which initiates their breakdown, releasing chlorine atoms that contribute to the depletion of the ozone layer. The long atmospheric persistence of CFCs means that their effects can be felt for many years after their use has been curtailed or eliminated, underscoring the importance of regulations like the Montreal Protocol aimed at phasing out these substances.

This understanding of CFC lifetimes highlights the need for careful consideration of substances that can remain harmful in the environment for an extended period, influencing policies and practices surrounding chemicals in refrigeration and other applications.