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Which of the following is/are responsible for the depletion of the ozone layer in the atmosphere?
Chlorofluorocarbons
Hydrofluorocarbons
Methane
Ethane
Chlorofluorocarbons
Chlorofluorocarbons (CFCs) are stable, man-made synthetic compounds that rise into the stratosphere, where ultraviolet radiation breaks them down to release chlorine atoms. These chlorine atoms act as catalysts to destroy ozone molecules, leading to the depletion of the ozone layer which protects Earth from harmful UV-B radiation.
Chlorofluorocarbons (CFCs) are stable, man-made synthetic compounds that rise into the stratosphere, where ultraviolet radiation breaks them down to release chlorine atoms. These chlorine atoms act as catalysts to destroy ozone molecules, leading to the depletion of the ozone layer which protects Earth from harmful UV-B radiation.
The Montreal Protocol (1987) is the landmark international environmental agreement designed to phase out the production and consumption of ozone-depleting substances, specifically CFCs.
CFCs were historically used in refrigerators, air conditioners, and aerosol propellants.
A single chlorine atom can destroy over 100,000 ozone molecules before it is removed.
Ozone depletion leads to increased skin cancer risk, cataracts, and disruption of marine ecosystems.
CFCs (e.g., Freon) are chemically inert in the lower atmosphere, allowing them to drift to the stratosphere.
Hydrofluorocarbons (HFCs) were introduced as replacements for CFCs; while they don't deplete the ozone, they are potent greenhouse gases.
Methane and Ethane are hydrocarbons that contribute to global warming via the greenhouse effect, but they do not cause ozone depletion.
The ozone hole is primarily observed over Antarctica due to the formation of Polar Stratospheric Clouds.
A is correct тАФ Chlorofluorocarbons (CFCs) are the primary anthropogenic chemicals responsible for the catalytic destruction of the ozone layer.
Always distinguish between Ozone Depletion (caused by CFCs) and Global Warming (caused by CO2, CH4, and HFCs). The Kyoto Protocol addressed global warming, while the Montreal Protocol addressed ozone depletion.
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