differentiate between CFCs and Ozone
Answers
Explanation:
Man-made compounds such as chlorofluorocarbons (CFCs), hydrofluorocarbons (HCFCs) and halons destroy ozone in the upper atmosphere (stratosphere). The stratospheric ozone layer makes life possible by shielding the earth from harmful ultraviolet (UV-B) rays generated from the sun. Decreased concentration of stratospheric ozone allows increased amounts of UV-B to reach the earth's surface.
Stratospheric ozone loss can result in potential harm to human health and the environment, including:
increased incidence of skin cancer and cataracts
immune system system damage
damage to terrestrial and aquatic plant life
increased formation of ground-level ozone (smog)
• Most stratospheric ozone depletion is caused when chlorine or bromine reacts with ozone. Most of the chlorine entering the stratosphere is from man-made sources (84%), such as CFCs and HCFCs with the remaining 16% from natural sources, such as the ocean and volcanoes. About half of bromine entering the stratosphere is from man-made sources, mostly Halons.
Climate change
While acting to destroy ozone, CFCs and HCFCs also act to trap heat in the lower atmosphere, causing the earth to warm and climate and weather to change. HFCs, which originally were developed to replace CFCs and HCFCs, also absorb and trap infrared radiation or heat in the lower atmosphere of the earth. HFCs, CFCs and HFCs are a subset of a larger group of climate changing gases called greenhouse gases (GHGs). Taken together greenhouse gases are expected to warm the planet by 2.5 to 8 degrees Fahrenheit by the end of century.
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