关于雾霾的英语PPT讲稿
Hello，everyone
Good morning！My name is Xiao Weihong,I’m from Sichuan province.And today,my topic is Fog and haze.This is my name,and this is my student number.
From this you can know that my topic is about 5 parts,and now,we look at the first part--Definition.Long long ago,we climb with our hands,as time goes by,We are walking upright.But the environment turns bad,we live in a world which is full of poison.In recent years, air pollution has already become one of the biggest environmental problems in China. Thick haze has blown off the coastal areas.So,what is haze?It’s a combination of little drops of water and tiny particles. For better understanding of this noun.Now,we should know another word--PM.It means particulate matter.It also means a small discrete[d?'skrit](离散的) mass of solid or liquid matter.So,we can easily know what is PM2.5.It means particles can be drawn into lung[l??], which diameter is less than 2.5 micron.We often pay our attention to PM2.5，because the number of 2.5 is very important ,if the diameter of particle is bigger than 2.5 micron,it will be stopped by our nose and will not go into our lung. But if
the size of particle is less than 2.5 micron.It harms us most.
So, wether['w?e?] our weather['w?e?] is good is determined by the number of PM2.5.Look at this picture,if the number of PM2.5 of per unit volume is less than 50,we say the air quality is good.if the number is between 50 to 100,we say the air quality is moderate.But if the number is between 151 to 200,we call it unhealthy.and if the number is above 300,we think it horrible.As we know,many places of China is even above 400.So,it’s very dangerous.
Now,let’s look a historical event.London smog!Let’s know about it.First,we watch a short video.(I don’t know wether the computer can paly it) Ok,from this short video we can see a black world full of smog.So,what happened in London?In 1952, London smog happened,and it lead to 12000 people died directly or indirectly.In 1954 ,London launched a special act of pollution.After 4 years later,smog happened again,and 1200 people dead.Only after 1965,the toxic smoke was vanished.In 1968,Britain enacted the Clean Air Act.And until 1980, the fog day has been reduced to five days one year.It took about 30 years to solve the problem.So,from this accident,we know that
once the fog happened, it will be hard to solve it.
How about our situation?First,Let’s look some pictures.There’re two contrast figures.The upper left corner is a picture of beautiful scenery,it’s clear,but the one at the lower left corner looks terrible.And the top right one is the map of our country which looks pretty,but from this one we can see nothing except haze.How about this one?Oh,it’s a man who wears a respirator['r?sp?ret?] is riding a bike in the endless smog.And again,this picture tells us a man is riding a bike in the road.It’s dangerous because it’s hard to see far. The last one,it looks beautiful in some degree.But like mushrooms,the more beautiful the more toxic it is.In fact,it’s very terrible.
So,what caused our country to be this situation ?These several reasons are we recognized.First,burning of fossil fuels in vehicles.As we know,the number of cars in our country is increased rapidly.so ,the demand of fossil fuels is increased fast,too .Second,in our country the power plants still rely on fossil fuels. It contributes to air pollution mostly.Third,various industrial processes are existed everywhere.Their emissions of waste polluted the air.
Therefore,it’s time to take some measures to change the situation .So, what should our government do? Firstly,our government should strengthen air monitor to know the the actual situation.Secondly, government should enact more strict laws and regulations in order to reduce the sources of pollution.Thirdly,government should regulate people 's daily action and the industrial https://www.360docs.net/doc/856091076.html,stly,our country should help develop green and energy-saving energy.Only do these can our country become beautiful again.For an individual,what should we do to reduce the harm of haze?First,if conditions permit,we can wear a respirator which can help us perhaps not much.Second,if we go out ,we should try to take public transportation.Third,hybrid['ha?br?d] cars should be regarded. Four,clean energy should be promoted in our daily life.In the last,the public supervision is important. Not only the role of government, but must have the personal effort.Only do this can we have a better tomorrow.So let’s do something from now on.
=============================================== =============
Thank you,yes,it dose harm our body.as i have said
before,the PM2.5 will go into our lung though our respiratory['r?sp?r?t?ri] tract.Long-term effects can damage respiratory defenses.Particles can cause the loss of the body's immune function.
Thank you!yes ,this is a question that we all care about.But as i said before,the haze is the result of long-term development.and I think it will not disappear totally in recent years.But if our government take more actions on the problem,it will be vanished faster than we expect.
1.As you have said that we live in a world of haze ,will it cause any harm to our body?
2.when do you think the haze will be vanished?
关于雾霾的英语演讲稿
关于雾霾的英语演讲稿 We Please But But, In Look, Pollution Days Are Scientists Do It Do The Free In Why It is very easy to break, and let us like our parents Rare it Now! 各位叔叔阿姨： 大家好!今天我演讲的题目是一个关于一个严峻的问题环境。我们只有一个地球! 也许你们觉得无所谓，但是，的确无所谓吗?连年冬天天气都是雾霾;石油、金属所剩无几，最多再用上2xx年就消耗完了，其实，2xx年分的短暂。请大家为自己的后代、子孙考虑考虑吧! 国家现在倡导节约。但，连年的食物浪费，使我们这个暂时不太富裕的国家压力更重了。但，也许你们会问：“为什么别的国家现在不经常有雾霾，那我就现在给你们一个解答：外国每个城市和每个城市之间都有一片片田地、树林，俗称：绿化带。所以，城市里的空气可以被进化，保持流通状态。 在20世纪60年初，别的国家已经一开始到这个严峻的问题也就是我们还在为自由奋斗的时刻，他们已经开始执行“绿化”命令了。瞧，这是一个多么悬殊的差距啊! 在中国首都北京，这个已被称为“雾都”的城市，仍然还没有好转的样子。连年污染，北京的空气早已混浊不清，有点像：雾霾逼近北京城的感觉。天天大堵塞，尾气排放量超标。难道，这些，我们这些中国人民要不阻止吗?我们国家的环境就这么不重视吗? 从19xx年之
后，南极冰块逐渐减少。科学家预计：如果地球再这样上升平均 气温，地球，离毁灭不远了。难道，我们真的要等待死亡的来临吗? 连年的森林面积较少;世界上每六个小时灭绝一种植物、动物;世界上有20%的人类没有水喝;有40%的人类没有食物。看来，我 们真的陷入一个无法自拔的地步了。我们难道没有什么解决的方 法吗? 是有，但是就看你这个“病人”要面子还是要治病了。最 好的方法植物造林、禁止随便砍伐树木、猎捕动物。随意浪费粮食、水、电是要受惩罚的，还要限制每月、每年用水、用电的定 要珍惜它们! 我们只有一个地球一个家园，一个辽阔的土地。 它，是很容易破碎的，那就让我们像我们的父母一样珍稀它吧! xx
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关于雾霾英语演讲稿 现在的空气污染非常严重，雾霾出现的次数越来越 多了。下面是的为大家精心整理的“关于雾霾英语演讲稿”，供大家参考！希望能够帮助到大家！更多精彩内 容请持续关注！ 篇一：关于雾霾英语演讲稿 Distinguished leaders, teachers and students: Hello everyone! My topic today is: to protect the ecological environment, away from the fog and haze! We have found it, this years autumn and winter, we Zhengzhou fog and haze have occurred. This time, the scope of the outbreak of serious pollution, the length of time this year, is rare for several years. Itchy throat, eye pain, eardrum pain, headache ......, many people appear haze symptoms. Protect the ecological environment, away from the fog and haze. Many of our students have to wear a thick mask, or the face with a scarf wrapped tightly, even our school calisthenics have stopped, fear of toxic air! Respiratory man surge. Air pollution, everyone is a victim, but most people are more or less
雾霾新闻(英文版)
China Environmentalists Slam Inaction over Smog 2013-12-09 19:24:42 Xinhua Web Editor: Xing Yihang The smog that blanketed over 100 cities in half of China last week has rekindled 重新点燃criticism of insufficient efforts in the fight against air pollution. Among urban residents, severely polluted air has become a main source of complaints and frustration over health concerns. Late last week, the Air Quality Index (AQI) in dozens of cities in eastern China topped or neared 500. AQI of over 300 cities is defined as "serious pollution." Many rushed to buy face masks and air purifiers to ward off 避开，挡住the choking smog, a result of decades of breakneck economic growth. The dirty air even forced all primary and middle schools in the eastern city of Nanjing to close for two days. "The smog is everywhere," said Xiong Yuehui, head of the science and technology department of the Ministry of Environmental Protection, at a meeting on Sunday in Shanghai. "If one place is
关于雾霾的英语话题作文
关于雾霾的英语话题作文 雾霾：样题一（环境保护类） 假如你是李华，你的笔友Mike从电视上得知前段时间北京多个地方出现雾霾（haze），非常担心，写E-mail询问有关情况，请回复。回复应包括以下要点： 1.实况描述； 2.对生活造成的影响； 3.成因简析与教训； 4.你个人的情况。 要求：1.词数100-120； 2.email的开头与结尾已给出，不计入总词数。 Dear Mike, Thank you very much for your concern. ___________________________________ ______________________________________________________________________ Regards! Yours， Li Hua 参考范文： One possible version: Dear Mike， Thank you very much for your concern. Last months several places in Beijing were blanketed with thick yellow fog. Everything around disappeared from oursight. Some highways were closed. Traffic jams were commonly seen in the streets. Many people, especially children and seniors, even found it difficult to breathe. As a result, local hospitals were crowded with people who had problems with their noses and lungs. Part of the cause was the dry weather, but the severely damaged environment contributed a lot to
有关雾霾的英语作文
Recently,the topic of air pollution has aroused more and more attention since pollution haze,a kind of weather,has appeared frequently in our cities.Just as the picture showed,when pollution haze comes,the whole city was covered with suspended particles（悬浮颗粒）which can breath into our body causing heavy problem to our health. Haze is air pollution which is mixed up with dust，smoke and other dry particles ，and it obscure（掩盖）the clarity of the sky and interacts （互相影响）with the natural environment.This kind of air pollutant come from a variety of natural and manmade sources（人为来源）. Natural sources can include windblown dust（风尘），and soot （灰）from wildfires. Manmade sources can include motor vehicles（机动车辆），and industrial fuel（工业染料）burning. The one of the main cause that touches off haze is manufacturing operations.（制造业务）. Many factories were over measure produced the smog that had over the standard and the smog seriously influence the air become air pollution. Last year several places in china were blanketed with（覆盖着）thick fog. Everything around disappeared from our sight. Some highways were closed. Traffic jams were commonly seen in the streets. Many people, especially children and seniors, even found it difficult to breathe. As a result, local hospitals were crowded with people who had problems with their noses and lungs. Part of the cause was the dry weather, but the severely damaged environment contributed a lot to this nightmare.
雾霾的英语中学生演讲稿5篇
雾霾的英语中学生演讲稿5篇 雾霾问题是人们追求利润而造成的，人们曾经对环境所做的现在已经得到了报复。现在人们已经意识到了大自然的报复是多么的大，保护环境是主要的任务。无论环境变得多坏，人们仍然要去做一些事情来弥补自己的错误。下面给大家分享一些关于雾霾的英语中学生演讲稿5篇，供大家参考。 雾霾的英语中学生演讲稿(1) A terrible thick fog in imperceptible in to. Look outside, can only observe a vast expanse of whiteness, the streets of thick fog, the school should also stop the course. It was a beautiful day, because the ghost weather and become monotonous. Around only a piece of white and gray, when driving a car, people can not see the front road conditions, as if into the stretch his hand not to see the five fingers of ecstasy hole. Car owners have opened a two-way light, with a sense of driving, but many cars are out of the accident. People are no longer going out, people go out to take a mask. Because this ghost weather not only affect the line of sight, is also harmful to the human body, is said to be the human respiratory system defense
关于雾霾的英语演讲稿
关于雾霾的英语演讲稿 关于雾霾的英语演讲稿 篇一:英文上海雾霾演讲稿 My speech As e all kno, a couple of days ago, a huge bronish haze covered Shanghai. Many people ere forced to ear masks in order to protect themselves because the heavy haze can cause breathing problems as ell diseases like headaches or even heart-attacks. Due to the bad effects from the air pollution, a green and clear environment is the apple of the hole orld’s eye. To avoid most of the pollution and help make our environment better, I have some advices: Firstly, e should go out as fe times as possible. This is truly a ay, but not a good one. Secondly, the government should bring out las hich limit the pollution of cars and factories. The air pollution ill decrease sharply if the cars and factories stop letting out harmful gases. Thirdly, e should enhance the aareness of environment protection and build up the thought of have a green life. For middle school students like us, e should sort the trash and try to alk on foot or use bikes as transportation as much as possible. Air pollution has bee a serious problem here in China no. Considering health problems, some timely measures should be taken to overe this problem. I don’t have daydreams, ishing China ill bee a country ith the best environment. I just hope e can breathe freely. All I ant no is just a
Smog is harmful to our health-有关雾霾、环境污染危害身体的英语演讲
Smog is harmful to our health Chris #Introduction Good morning, ladies and gentlemen! My topic today is “Smog is harmful to our health”. According to the American Lung Association, your lungs and heart can be permanently affected by air pollution and smog. If we inhale too much smoggy air, it may lead to different types of short-term health problems, here, I will cover 3 points: First of all, smog may lead to coughing and throat irritation. Then, smog may lead to chronic diseases. Lastly, smog may lead to lung damage. #Body I have talked about 3 types of health problems, then I am going to give you some proofs: Firstly, smog may lead to coughing and throat irritation. A study of 10 adult men exposed to .12 ppm ozone for 6.6 hours , found that lung function decreased and coughing increased over the more than six hours of exposure. Secondly, smog may lead to chronic diseases. David Abbey, doctor of Loma Linda University, studied a group of 6,340 people. Results of the study suggest long term exposure to air smog may increase the risk of chronic diseases by about 33%. In addition, it may higher the risk of developing some form of cancer. Thirdly, smog may lead to lung damage. In a study done on rats, continuous exposure to smog caused restrictive lung disease. While removal of the smog can reverse the disease state back to normal. #Conclusion In conclusion, I have talked about 3 points. First of all, I talked about coughing and throat irritation. The more vigorous your activity level, the greater your chances of experiencing respiratory problems. Then, I spoke about chronic diseases. Please remember it’s necessary to limit your outdoor activities as ozone levels rise to unhealthy levels. Lastly, I told you about lung damage. Please remember to wear a mask while the air is smoggy.
雾作文之雾霾成因英语作文
雾霾成因英语作文 【篇一：关于雾霾的英语作文】 关于雾霾的英语作文 haze is air pollution in which is mixed up with dust, smoke and other dry particles ,and it obscure the clarity of the sky and interacts with the natural environment. 雾霾是空气污染和灰尘,烟雾和其他干燥粒子,它掩盖了清晰的天空,与自然环境进行交互。 雾霾原因 this kind of air pollutant come from a variety of natural and manmade sources. natural sources can include windblown dust, and soot from wildfires. manmade sources can include motor vehicles, and industrial fuel burning, and manufacturing operations. the one of the main cause that touches off haze is manufacturing operations. many factories were over measure produced the smog that had over the standard and the smog seriously influence the air become air pollution.这种空气污染物来自各种自然和人为来源。天然来源可以包括风沙、烟尘从森林大火。人为来源可以包括机动车辆、工业燃料燃烧和制造业务。触动了烟雾的主要原因之一是制造业务。许多工厂测量产生的烟雾对标准和烟雾严重影响空气成为空气污染。 雾霾危害 the components that make up haze may have negative effect on peoples health especially that of the children and the elderly. also not excluded are those who have certain diseases such as asthma, allergy, and pneumonia and lung disease. workers working in the open air have a high risk in their health.组件构成烟雾可能对人们的健康有负面影响特别是儿童和老人。也
雾霾 英文介绍
Hello，everyone Good morning！My name is Xiao Weihong,I’m from Sichuan province.And today,my topic is Fog and haze.This is my name,and this is my student number. From this you can know that my topic is about 5 parts,and now,we look at the first part--Definition.Long long ago,we climb with our hands,as time goes by,We are walking upright.But the environment turns bad,we live in a world which is full of poison.In recent years, air pollution has already become one of the biggest environmental problems in China. Thick haze has blown off the coastal areas.So,what is haze?It’s a combination of little drops of water and tiny particles. For better understanding of this noun.Now,we should know another word--PM.It means particulate matter.It also means a small discrete[d?'skrit](离散的) mass of solid or liquid matter.So,we can easily know what is PM2.5.It means particles can be drawn into lung[l??], which diameter is less than 2.5 micron.We often pay our attention to PM2.5，because the number of 2.5 is very important ,if the diameter of particle is bigger than 2.5 micron,it will be stopped by our nose and will not go into our lung. But if the size of particle is less than 2.5 micron.It harms us most. So, wether['w?e?] our weather['w?e?] is good is determined by the number of PM2.5.Look at this picture,if the number of PM2.5 of per unit volume is less than 50,we say the air quality is good.if the number is between 50 to 100,we say the air quality is moderate.But if the number is between 151 to 200,we call it unhealthy.and if the number is above 300,we think it horrible.As we know,many places of China is even above 400.So,it’s very dangerous. Now,let’s look a historical event.London smog!Let’s know about it.First,we watch a short video.(I don’t know wether the computer can paly i t) Ok,from this short video we can see a black world full of smog.So,what happened in London?In 1952, London smog happened,and it lead to 12000 people died directly or indirectly.In 1954 ,London launched a special act of pollution.After 4 years later,smog happened again,and 1200 people dead.Only after 1965,the toxic smoke was vanished.In 1968,Britain enacted the Clean Air Act.And until 1980, the fog day has been reduced to five days one year.It took about 30 years to solve the problem.So,from this accident,we know thatonce the fog happened, it will be hard to solve it. How about our situation?First,Let’s look some pictures.There’re two contrast figures.The upper left corner is a picture of beautiful scenery,it’s clear,but the one at the lower left corner looks terrible.And the top right one is the map of our country which looks pretty,but from this one we can see nothing except haze.How about this one?Oh,it’s a man who wears a respirator['r?sp?ret?] is riding a bike in the endless smog.And again,this picture tells us a man is riding a bike in the road.It’s dangerous because it’s hard to see far. The last one,it looks beautiful in some degree.But like mushrooms,the more beautiful the more toxic it is.In fact,it’s very terrible. So,what situation caused ?These our several country to be are this we reasons
关于雾霾的英语演讲稿
关于雾霾的英语演讲稿 篇一：英文上海雾霾演讲稿 My speech As we all know, a couple of days ago, a huge brownish haze covered Shanghai. Many people were forced to wear masks in order to protect themselves because the heavy haze can cause breathing problems as well diseases like headaches or even heart-attacks. Due to the bad effects from the air pollution, a green and clear environment is the apple of the whole world’s eye. To avoid most of the pollution and help make our environment better, I have some advices: Firstly, we should go out as few times as possible. This is truly a way, but not a good one. Secondly, the government should bring out laws which limit the pollution of cars and factories. The air pollution will decrease sharply if the cars and factories stop letting out harmful gases. Thirdly, we should enhance the awareness of environment protection and build up the thought of have a green lifestyle. For middle school students like us, we should sort the trash and try to walk on foot or use bikes as transportation as much as
关于雾霾的英语作文带翻译_作文专题
关于雾霾的英语作文带翻译 雾霾污染环境，严重危害我们的·健康。那么关于雾霾的英语作文有哪些呢?下面是橙子为大家精心挑选的关于雾霾的英语作文带翻译，希望对大家有所帮助。 关于雾霾的英语作文篇一Since the development of the technology, the society gets modernized, people make use of the high technology to pursue more profit. Though the government has noticed the problem that people do to the environment, they still can’t prevent negative result that the polluted environment brings. Many years ago, the most prominent problem of the polluted environment is that the river and the water were changed their color, some fish even died for the polluted river. Now the situation becomes ever worse, lately, in the big city, like Beijing and Shanghai, people are annoyed by the bad weather. It is not the rainy day, but the haze around the sky, there is no way for people to run away for it. The haze contains toxic elements, people breathe it and hurt their bodies. 1 / 7
英语作文：雾霾天气
假如你是李华，你的英国笔友Bill来信询问你家乡是否有雾霾天气，情况如何。请按下面写一封电子邮件 1。感谢他得关心，2。介绍情况:（1）去年以来以发生数次雾霾天气（2）人们已认识到雾霾天气的危害，正采取各种举措减少其发生（3）你自己为此做了什么或打算做什么要求150--200词 Dear Bill, I’m glad to receive your letter, thank you for your caring for the weather and my health. Now I’d like to tell you something about the smog. Since the winter last year, the smog has occurred a lot of times. it has done great harm to our daily life. many traffic accidents happened just because of the heavy smog weather, more and more people have to go to see the doctor because the serious disease caused by the smog, quite a lot of flights have to be put off, a great number of people have to stay at home for fear of the poisonous air caused by the smog. People have realized the great harm caused by the smog and the importance of protecting the environment. people all over the country are taking measures to reduce the smog weather. the government suggests people go to work or school with the public traffic, such as the bus and the underground. Also we should plant more trees. According to me, I will go to school by bike or on foot, and I won’t throw the waste anywhere. in addition, I will tell the people I meet to protect the environment as possible as they can. would you like to tell me some good ideas? I’m looking forward to your reply. Yours, Li Hua Pollution Haze Recently, the topic of air pollution has again aroused more and more attention since pollution haze, a kind of weather, has appeared increasing frequently in our cities. Just as the picture showed, when pollution haze comes, the whole city was covered with suspended particles which can breath into our body causing heavy problem to our health. Due to the bad effect from pollution haze, a green and clear environment, rather than anything else, turns to be an important role and a urgent issue in our daily lives. Meanwhile we just live in only an earth, if we didn’t try to protect our co mmon hometown, we would have no place to settle. Thus, we should take effective measures to rebuild our beautiful environment of the cities from now on. In my opinion, law and regulations should be enforced by the government and authorities to control the emission of polluting gas. To ourselves, we should enhance the awareness of environment protection and choose a green lifestyle to make contribution to our earth day from day.
雾霾天气演讲稿
雾霾天气演讲稿 ----WORD文档，下载后可编辑修改---- 下面是小编收集整理的范本，欢迎您借鉴参考阅读和下载，侵删。您的努力学习是为了更美好的未来！ 雾霾天气演讲稿篇一各位老师、同学们： 大家早上好!我是 .今天我国旗下讲话的题目是《保护环境，远离雾霾》。 这几天，新闻报纸最大的新闻呢就是雾霾天气，很多地方的学校都因此停了好几天的课。现在我们面临的最大敌人就是各种各样的环境问题!大气污染超标、温室效应增强、土地沙漠化、水污染严重、物种消失加剧、雾霾现象增多等，为什么环境问题越来越多呢?都是因为我们对自然资源和生态环境的不合理利用和破坏。 在校园中，我们也经常看到一些我们不愿意看到的情景：操场上、楼梯上、走廊上有纸屑、食品袋;雪白的墙壁上被印上手印、脚印和球印;教室里、走廊上留有难以清除的口香糖的污迹...... 千里之行，始于足下。保护环境，要从我做起，从小事做起。只要我们养成良好的习惯，不乱丢垃圾，不浪费粮食，节约用水，节约能源，节约用纸，拒绝使用一次性的“白色污染物”，多栽树种草等等。那么，我们头顶上的天空将会变得更蓝，身边的河水会变得更清，空中的鸟儿将会鸣叫得更加响亮，生活在其中的人们将会变得更加健康快乐。 让我们大家从今天开始行动起来吧，保护环境，从我做起!
谢谢大家! 雾霾天气演讲稿篇二美丽中国，众所期待。党的提出建设美丽中国，为生态建设、环境保护确立了新的目标。如果中华大地被雾霾笼罩，如何看见她的美丽?”当“美丽中国”迅速成为高频词之时，曾有网友如此发问：“雾霾笼罩，是危机，亦蕴藏转机!”党的把生态文明建设与经济建设、政治建设、文化建设、社会建设并列，作为建设中国特色社会主义的总任务。一场覆盖百万平方公里的雾霾，更使生态文明建设的重要性、迫切性前所未有地突显出来。 坚持环保为民,应对雾霾带动深层次污染防治。 面对大范围雾霾天气，多部门紧急行动起来，首先将灾害天气对公众的影响降至最低。1月28日，中央气象台历史上第一次专门针对霾发布了预警;环境保护部及时发布部分城市大气环境质量状况，要求各地做好监测预警工作。 对于憧憬美丽中国的人们来说，雾霾是当头一棒，更是一记警钟，公众需要透明的数据，更需要一个澄澈的天空。建立长效机制、全力做好污染物减排，我们还需付出更多努力。2月6日，国务院常务会议确定实施“国四”柴油、“国五”汽、柴油标准的时间表，解决长期难以突破的车油不配问题看到了曙光。不仅如此，各地正在积极行动起来，以唤回蓝天为突破口，加紧推进大范围、深层次的污染防治。 推进绿色转型，改变生活和生产方式刻不容缓。 无论在哪里过年，今年春节人们普遍感觉鞭炮声少了。民间的“禁鞭”活动，折射出全社会的环保意识正从抱怨污染走向自觉践行