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Unit VI question - 1.Many people confuse the large void in...

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1.Many people confuse the large void in the ozone layer with global warming. Can you distinguish between the two phenomena? Explain how each process may harm living things Ans. Large void in the ozone layer is due to Ozone layer depletion. Global warming is the rise in average global temperature. It has been indicated by IPCC that during the 21st century the global surface temperature is likely to rise a further 1.1 to 2.9 °C for their lowest emissions scenario and 2.4 to 6.4 °C for their highest (Meehl et al., 2007). The rise in global temperature is due to increased emission of green house gases. CO2 content of the air is increasing due to deforestation and combustion of fuel in industries, automobiles and planes. This increase is affected the composition and balance of gases in the atmosphere. As CO2 accumulates in the air, it absorbs more infra-red radiation. It may cause green house effect raising the atmospheric temperature. In the stratosphere, about 50 km above the surface of the Earth, there is a layer of ozone gas called ozone shield that absorbs the ultra-violet rays of the sun so that they do not strike the Earth. Thus ozone protects living organisms from the harmful effects of high energy U-V rays. But depletion of ozone layer in recent years is a serious problem. The cause of ozone depletion is due to the release of chlorine atoms into the atmosphere. One atom of chlorine can destroy upto 1, 00,000 molecules of ozone. These chlorine atoms come from the breakdown of chlorofluorocarbons (CFCs). The CFCs are used
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