英语unit7 Pollution 污染 全英文课件.ppt

Unit 7;;Water pollution;Car pollution;Smog in My City;I am not checking up on the weather.Instead,I want to know exactly how bad the pollution is going to be. On some mornings,it is truly horrible. It is as if the whole city has been turned into a smokers’ room with a yellowish color staining the sky.;And this month,pollution in my city went from bad to... well,dangerous.The hospitals were filled with patients,old and young,suffering from breath-related problems.People were warned to stay indoors and the streets were unusually quiet. ;Sales of air purifiers for homes,as well as face masks,rocketed and some stores simply ran out .Even for a city that is used to pollution,this was an emergency. ;For years, the local authorities often played down the pollution in the city, insisting it was fog in most cases, despite evidence to the contrary that was plain for all to see.;Faced with public pressure , the local authorities started publishing the hourly air-quality readings this year. And when the recent unusually heavy smog hit, the state media, for the first time on this issue, made its voice heard.; The pollution story led the country’s main evening TV news program. Even the major national daily newspaper ran a headline asking“What’s wrong with our air ?”.Well, the answer is not far to seek. The problem is caused by the country developing at a speed and scale unheard-of in history. It has been growth at all costs, resulting in widespread environmental worsening.; Coal-burning energy plants power the country’s factories; they provide the heat for hundreds of millions of homes, but they also emit poisonous gases into the air. In my city alone, several million cars choke the streets, an illustration of the country’s growing prosperity. But all these vehicles, normally bumper to bumper, are also a sign of a country that is not coming to terms with pollution. And it is not just the air quality. Lakes, rivers and underground water supplies have all been badly p