air pollution speech_airpollution的原因
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I’ve prepared short speech about our environment.You probably know something about air pollution but I’m going to tell you something more.We often hear phrase: ‘I’ll go out for a breath of fresh air’.But how many of us realize that this has become irrelevant in today’s world, because the quality of air in our cities is realy bad.The moment you step out of the house and are on the road you can actually see the air getting polluted;a cloud of smoke from the exhaust of a bus, car, or a scooter;smoke billowing from a factory chimney, fly ash generated by thermal power plants, and speeding cars causing dust to rise from the roads.Natural phenomena such as the eruption of a volcano and even someone smoking a cigarette can also cause air pollution.Air pollution is aggravated because of four developments: increasing traffic, growing cities, rapid economic development, and industrialization.The Industrial Revolution in Europe in the 19th century saw the beginning of air pollution as we know it today, which has gradually become a global problem.Another effect of air pollution is acid rain.The phenomenon occurs when sulphur dioxide and nitrogen oxides from the burning of fuels combine with water vapour in the atmosphere and fall as rain or snow.These gases can also be emitted from natural sources like volcanoes.Acid rain causes extensive damage to water, forest, soil resources and even human health.Many lakes and streams have been contaminated and this has led to the disappearance of some species of fish and it also has extensive damage to forests and other forms of life.It can corrode buildings and be hazardous to human health.Because the contaminants are carried long distances, the sources of acid rain are difficult to pinpoint and hence difficult to control.In many countries in the world, steps are being taken to stop the damage to our
environment from air pollution.Scientific groups study the damaging effects on plant, animal and human life.Legislative bodies write laws to control emiions.Educators in schools and universities teach students, beginning at very young ages, about the effects of air pollution.But it does’ t help.In the world there are still lots of people who don’t care about our
environment.We should encourage them to protect it.The world is our home so we should take care of it.We should encourage our family not to use car so often, whenever poible take their bicycle or use public transport.It isn’t hard to do.If everyone do it, our environment will become more clear.Thanks.
