Question
Describe the ozone layer depletion and its impact on biosphere
Answer :
Word Count : 861
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The ozone layer is a fragile, protective layer of ozone (O₃) molecules located in the stratosphere, roughly 15 to 35 kilometers above Earth's surface. This layer plays a crucial role in absorbing the majority of the Sun's harmful ultraviolet (UV) radiation, particularly UV-B and UV-C rays, which can be detrimental to living organisms. The depletion of the ozone layer has emerged as a significant environmental issue, driven largely by human activities that release ozone-depleting substances (ODS) into the atmosphere. These substances include chlorofluorocarbons (CFCs), halons, carbon tetrachloride, and methyl chloroform. Once released, these compounds slowly rise to the stratosphere, where ultraviolet radiation breaks them down, releasing chlorine and bromine atoms that catalytically destroy ozone molecules. A single chlorine atom can destroy thousands of ozone molecules, initiating a chain reaction that drastically reduces the ozone concentration. The discovery of the “ozone hole” over Antarctica in the mid-1980s highlighted the severity of this issue. Measurements revealed a seasonal thinning of the ozone layer, particularly during the Southern Hemisphere spring, caused by complex interactions between ODS, extreme cold temperatures, and polar stratospheric clouds. While the Antarctic ozone hole represents the most dramatic example, ozone depletion has also been observed at other latitudes, albeit at a slower rate. The reduction of ozone in the stratosphere leads to an increased penetration of UV-B radiation to Earth's surface, which poses serious risks to both ecosystems and human health. The impact of ozone layer depletion on the biosphere is multifaceted. In humans, increased exposure to UV-B radiation can lead to a higher incidence of skin cancers, including melanoma and non-melanoma types, as UV-B causes direct DNA damage in skin cells. Additionally, it can accelerate skin aging and suppress the immune system, reducing the body’s ability to fight certain infectious diseases. Eye health is also affected, with higher UV exposure increasing the risk of cataracts and other ocular disorders that can impair vision. Children are particularly vulnerable to these effects due to the sensitivity of their developing tissues. Terrestrial ecosystems are also impacted by
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