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castor
Senast uppdaterad: 2021-01-04
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we are all aware today that pollution is an increasing environmental problem. today many people regard pollution as a problem that will not go away, but one that could get worse in the future. the existence of pollution in the environment, as a national and a world problem. pollution is caused by the on purpose or accidental pollution like wastewater from the oil refineries or cities; tankers accidents also account for the oil pollution. nowadays, pollution is usual to subdivide it into the artificial divisions of air, land, water, noise pollution. nowadays, motor vehicles discharge 900 million tonnes of carbon dioxide a year - about 15 percent of our total output. more vehicles can make more global warming. if numbers of automobiles keep increasing like a present rate, it will be more than a billion vehicles on the road by 2025. also by 2025, two-thirds of the world's people will live in cities, so traffic jams and pollution will become a big problem in most people's lives. worst of all will be the megacities of asia. therefore, such as calcutta, beijing and shanghai will each be home to as many as 20 million people, bombay reaches 25 million. live in the countryside may not be a good idea. asia is heading for a downpour of acid rain that will destroy forests and shrivel crops. the worst hit looks like being south-east china, north-east india, thailand, and korea, where economic growth is powered by fossil fuels rich in sulfur. industrialized nations have reduced so2 emissions. they have also cut production of cfcs and halons, the chemicals that destroy stratospheric ozone. however, the ozone layer is still in danger. developing nations have until 2010 to slash production under the montreal protocol.
Senast uppdaterad: 2021-04-05
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