第一篇:全球气候变暖的评课稿
展示冰激凌式即将融化的地球,接着用北极熊寻找食物引出北极变暖问题,并顺势引出全球气候变暖问题。然后引导学生分析“问题研究的常用思维模式”,并在此模式之下提出研究问题:1.你能提供气候变化的一些证据么?2.全球气候变化有着什么样的特点呢?3.什么原因导致全球气候变暖?4.气候变暖会给地球带来什么样的影响?5.面对全球气候变暖,人类应该怎么办?然后回扣北极熊寻找食物,指出人类应该采取有效的措施,还北极熊一个美好的明天。
肖老师的课堂上,我观摩到如下现象:
一是教师选取的图像丰富多彩,可获取的图形信息也很丰富。肖老师上课伊始,先用冰激凌式地球,引发学生想象;然后用北极熊寻找食物视频,激发学生学习兴趣;用文字图“豫”(河南历史上曾经有象群生活)、景观图(广东新会区崖门镇的“冰臼”、楼兰古城、月牙泉、资料图(纳木错面积扩大)等图文资料,拓展学生视野,开阔学生思维,使“全球气候变暖”显得证据确凿,令人十分信服。
二是注重方式方法的指导。在授课之前,肖老师先用“问题研究的常用思维模式”引出本节课研究问题的主要思路,然后顺着这个思路,一路追寻下去,环环相扣,既显得思路清晰,又给予学生一科学的分析问题的方式方法。在分析全球气候变暖的特点时,肖老师展示“全球气候的长期递变”和“近百年来全球年平均气温的变化”示意图,引导学生读图、析图,并顺势得出全球气候变化的特点。
三是注重适时点拨。在分析气候变暖会给地球带来哪些影响时,肖老师看到学生不知所措时,及时地建议“1.可以全面分析,也可选择某一方面深入分析;2.可以全球视角,也可局部视角如:我国视角;3.讨论交流中,用因果关系图展示你们组(前后四人一组)的推测。”并展示因果关系图,让学生仿照理清气候变暖带来的影响。
四是注重学生展示,当学生通过研讨绘出了全球气候变暖的因果关系图时,肖老师及时让学生上讲台上展示小组研究所得。
五是运用角色扮演的房山,引导学生思考如何遏制全球气候变暖。
一节课上下来,肖老师给我留下了深刻的印象。我对其课堂教学作短评如下:
课堂教学目标明确,调控得当;学生主体意识强烈,探究积极;
素材信息海量丰富,拓展到位;问题研究方法灵活,指导适时;
从“聚焦课堂,生长课堂”这种全国性活动来看,这节观摩课上得可谓风生水起,别开生面,富有特色:课堂上学生主体意识得以强化,教师指导角色得以彰显,教师讲得少,学生讲得多了,研究的时间也充足了。学生动起来了。
可是,从教学的有效性角度看,我觉得多少还是有点问题的,因为课堂上缺少巩固练习。我们知道,现阶段我们的课堂教学是无法摆脱应试的控制的。我们的教学有效性,多多少少还是要从应试教育的要求上去验证的。
第二篇:浅谈全球气候变暖
浅谈全球气候变暖
浅谈全球气候变暖
□ 梁竹鹏
(浙江理工大学法政学院法学10(1)班H10720132浙江杭州 310016)
摘要:21世纪的世界,战争和饥饿只会发生在局部地区,绝对不会影响到整个世界;然后,这并不表示没有其他威胁全世界的因素。这几年,无论是是欧美、中亚还是南北极的人们都明显感受到了与往年不一样的气候,极端天气发生的的频率不断提高,海平面日益上升,冬天逐渐在消失,欧亚大陆不在四季分明,南北极不在万里冰封。造成这一变化的正是全球性的气候变暖。全球气候变暖带来的影响绝对不止上面所举的例子,它正在成为继战争、饥荒之后对世界影响最大的事件之一。下面我们就从全球变暖产生的原因、后果以及应对措施等方面来探讨了解,唤起人们对这一问题的重视。关键词:气候 变暖 现象 措施
一、全球气候变暖给地球带来的影响
世界上很多国家都在担心全球变暖这一问题,都纷纷在寻找遏制和应对这一现象的措施,其中也包括各个国家的领导人。那么,我们凭什么说地球在变暖,而且地球变暖正在威胁着人类的生存,我们必须刻不容缓的找到应对它的措施呢?
其实,只要你是一个热心生活的人,你就会在很多方面发现今天的气候跟往年有很大的不同,很多人都会在感叹好多年都没看到下很大很大的鹅毛大雪了,那些记忆似乎很遥远了;就拿今年来说吧,明明眼看就要立冬了,可气温似乎并不是很冷,至少比起往年要热的多,晚上睡觉的时候还时常会受到早该消失了的蚊子的侵扰。这些都是气候变暖的表现。
上面说的现象都是我们自己身边的感受,至于全球变暖到底给我们带来了怎样的影响,我们从以下几个方面来认识。①全球气温将升高。从现在起到本世纪末,人类将面临史无前例的气温上升。就本世纪而言,较乐观的预测是全球气温将升高1.4摄氏度,最悲观的设想则认为,全球气温将上升近6摄氏度。最好的例子就是纽约市今年1月6日最高温度达到21.7摄氏度,打破了1950年创下的17.2摄氏度的纪录。②海平面将升高。在本世纪内,海平面将可能升高20厘米至80厘米。原因是气候变暖导致海水膨胀,冰川和海上浮冰层融化(北极浮冰层厚度50年来减薄了40%)。在格陵兰,自1988年以来,冰川融化速度加快,已提高了2倍。海平面升高就可能导致某些岛屿国家或者沿海城市被淹没。③近几年来,极端气候现象增多。大多数专家认为,在今后50年内,法国每2年就会出现一次2003年那样的酷热(当年造成1.5万人死亡)。干旱将给农业造成严重影响(气温升高2摄氏度将可能使农业减产30%)。在欧洲南部,降雨量将明显减少。④据绿色和平组织说,到2050年,疟疾造成的死亡人数(每年在100多个国家造成250万人死亡)将可能翻一番,并将越过地中海在西班牙、意大利和法国登陆。其他严重的热带疾病也将随之而来,如通过飞蝇传播而造成消化道疾病的尼罗河病毒或利什曼病毒。另外,哮喘患者也将增加,因为炎热的天气将带来更多的花粉。⑤援引法国绿色和平组织负责人雅多的话说,如果气候变暖继续照此速度发展,那么到2050年将会有百万物种消失,即占各种生物种类的40%,而法国本土将会有20%的物种消失。北极熊和北极的其他动物将会像珊瑚礁水域的鱼一样成为主要受害者。德国的一项研
浅谈全球气候变暖
究表明,气候变暖将威胁到鱼的生存,因为气候变暖会引起水中氧气减少。这仅仅是全球气候变暖带来的其中5个最明显的影响。
二、全球变暖产生的原因
全球变暖真实而恐怖的威胁着人类赖以生存的地球,因此,拯救地球遏制全球变暖已经刻不容缓,我们必须在尽量短的时间内寻找到解决问题的途径。然而要找到解决的方法就有必要了解产生问题的原因,找到问题的源头才能治本。在世界人民的共同努力下,我们找到了全球变暖的几大原因,可能不全面但也大致搞清楚了变暖的缘由。这些原因大致有1.人口剧增因素,近年来人口的剧增是导致全球变暖的主要因素之一。同时,这也严重地威胁着自然生态环境间的平衡。这样多的人口,每年仅自身排放的二氧化碳就将是一惊人的数字,其结果就将直接导制大气中二氧化碳的含量不断地增加,这样形成的二氧化碳“温室效应”将直接影响着地球表面气候变化。2.大气环境污染因素,目前,环境污染的日趋严重已构成一全球性重大问题,同时也是导致全球变暖的主要因素之一。现在,关于全球气候变化的研究已经明确指出了自上个世纪末起地球表面的温度就已经开始上升。3.海洋生态环境恶化因素,目前,海平面的变化是呈不断地上升趋势,根据有关专家的预测到下个世纪中叶,海平面可能升高50cm。如不采取及对措施,将直接导致淡水资源的破坏和污染等不良后果。另外,陆地活动场所产生的大量有毒性化学废料和固体废物等不断地排入海洋;发生在海水中的重大泄(漏)油事件等以及由人类活动而引发的沿海地区生态环境的破坏等都是导致海水生态环境遭破坏的主要因素。4.土地遭侵蚀、沙化等破坏因素,造成土壤侵蚀和沙漠化的主要原因是不适当的农业生产。众所周知良好的植被能保持水土流失。但到目前为止,人类活动如为获取木材而过度砍伐森林、开垦土地用于农业生产以及过度放牧等原因,仍在对植被进行着严重的破坏。目前全世界平均每分钟有20公顷森林被破坏,10公顷土地沙化,4.7万吨土壤被侵蚀。土壤侵蚀使土壤肥力和保水性下降,从而降低土壤的生物生产力及其保持生产力的能力;并可能造成大范围洪涝灾害和沙尘暴,给社会造成重大经济损失,并恶化生态环境。5.森林资源锐减因素,在世界范围内,由于受自然或人为的因素而造成森林面积正在大幅度地锐减。6.地球周期性公转轨迹的变动,地球周期性公转轨迹由椭圆形变为圆形轨迹,距离太阳更近。根据某科学家的研究地球的温度曾经出现过高温和低温的交替,是有一定的规律性的。从这些原因中我们可以总结出这样一个规律,其实导致全球变暖的最根本原因就是温室气体——二氧化碳的大量排放和增加。
三、应对全球变暖的措施
了解全球变暖给我们带来的影响是为了让我们对这一问题产生足够的重视,而分析产生这一问题的原因是为了对症下药,更有效的遏制和防范全球继续变暖。因此,在上文中阐述了全球变暖的影响和原因之后,我们就有必要去寻找解决问题的方法,即应对全球变暖的措施。
我们从以上的原因分析中已经知道,温室气体是造成全球变暖的主要原因,所以我们应该重点从温室气体下手。首先我们要想办法努力减少温室气体的排放,其实当下国际上的很多国家都认识到了这一点,并从碳排放着手试图走出全球变暖的困境。欧盟:政策机制保障低碳经济发展;美国:通过立法来保障低碳经济发展;日本:将发展 “低碳经济” 定位为创建 “低碳社会”;中国:通过政策法令进行低碳减排。.国际经济向低碳经济转型,世界进
浅谈全球气候变暖
入低碳时代。2003 年英国首先提出“低碳经济”概念,在后来的“巴厘路线图”中,低碳经济被进一步肯定,2008年的世界环境日主题定为“转变传统观念,推行低碳经济”。2009年12月7日至12月18日,联合国气候变化大会在哥本哈根举行,发表了不具有法律约束效力的《哥本哈根协议》,就发达国家实行强制减排和发展中国家采取自主减缓行动作出了安排,并就全球长期目标、资金和技术支持、透明度等焦点问题达成广泛共识。这是国际上从减少碳排放的角度出发的,其实,如果在世界范围内我们提高对森林和植被的重视,不肆意破坏森林和植被,科学合理的利用这些资源,更重要的是我们可以植树造林恢复植被,这样对于碳的吸收是很有帮助的。
另外,我们作为一个普通的世界公民,虽然不能对世界上大规模的碳排放产生重要影响,我们的力量似乎微不足道,但团结的力量是伟大的,我们可以从身边的小事做起,为减少碳排放做出自己的一份贡献。比如,我们在平时的生活、工作中可以减少一次性筷子等一次性物品的使用,少用或者不用塑料袋,草稿纸反复使用,多步行或者乘坐公共交通工具少开车,随手关灯少开空调等等。这些都是我们力所能及的事情,如果我们大家都这样做了,那对 缓解全球变暖是很有帮助的。
四、结束语
21世纪我们都是世界公民,地球的安危就是我们自己的安危,全球气候变暖威胁着整个人类的生存和发展,为了我们的子孙后代,也为了我们薪火相传的人类文明,我们必须团结起来,用我们每个人的力量拯救地球,阻止地球越来越热。
参考文献
[1] 张梦旭:《低碳经济转型的国际经验与发展趋势》.[2] 张文明、陆骏、姜言萍:《中国:走好低碳之路》,《经济师》2011年第1期 [3] http://news.sina.com.cn/w/2007-01-08/075610946155s.shtml [4] http://news.qq.com/a/20091126/002490.htm
第三篇:全球气候变暖演讲稿
(女)
1、看着清澈的河水,听着风中,瑟瑟的落叶,我们听见鸟鸣,听见蛙声,我们抚摸青草,感受着河岸旁泥土的芳香,周围一片祥和与宁静,可是突然之间,似乎这些美景离我们越来越远了。(注意要读得缓慢、轻松)
(男)
2、美丽的地球拥有撩人的自然美景。然而,如今的地球正在遭受着前所未有的灾难!(女)
3、有人说------我们不会对地球造成什么不可弥补的破坏 然而,事实上。。她已经伤痕累累(突出伤痕累累)
(男)
4、这是赤道雪山乞力马扎罗山的前后对比照,若干年后,乞力马扎罗山上,将不再有冰雪。(女)
5、这是美国冰河国家公园,因全球变暖这里的冰川预计还有15年就会消失。/这是阿根廷30年后与30年前的对比。同学们从这些信息上你们看到了什么?
(男)
6、我们都知道二氧化碳与温度是有联系的:二氧化碳越多气温越高,因为它会将更多的太阳热量困在地表上,我们来看一组数据:65万年以来二氧化碳从未超过300,可是现在它的值远远超过我们所能统计到的历史水平,不过请各位注意!50年以内,真的!50年以内!曲线还会继续爬升,会超出这个表格。(语气转折)恐怕有人会说:“这又如何?看起来不错嘛。”我再重申一遍,这已经不是一个政治问题而是道德行为。我们许多习以为常的事情将会逐渐消失!
(女)
7、地球有两大警钟,一个是北极,说它是警钟,因为北极是世界上受全球变暖影响最大的区域之一。1970年开始冰层的宽度和厚度出现急剧下降40年内减少了40%,目前的两项主要研究表明,未来50到70年内,这里夏季将不再结冰!
(男)
8、“以格陵兰目前的状况,我们不得不重绘世界地图”
(注意由于ppt数量多,停顿4秒)
(女)
9、人们首次发现了淹死的北极熊,它们漂游超过60英里以寻找冰面,这是过去从未有过的景象。
(男)
10、2009年12月,一只雄性北极熊叼着一只小北极熊的头部。气候变化已致使一些北极熊同类相残:全球逐渐变暖的气候使北极熊在北极冰区的狩猎场融化,致使北极熊的数量日益减少(女)
11、地球的另一警钟是南极——目前地球上最大的冰层(男)
12、冰层融化,整个冰架就像一块瑞士奶酪或是白蚁洞一样
(女)
13、我们来看这几幅图片,如果格陵兰融化瓦解,或者格陵兰和南极洲西部各融化一半„„将会出现哪些现象。
(男)
14、美丽的福罗里达州面积将会减少一半;电子工业的传奇硅谷所在地,旧金山淹没前与淹没后的对比;鲜花王国荷兰将不复存在,还有还有!(强调,重读!)我们的首都北京危在旦夕,我们来看看中国最繁华的地方上海,她将面目全非。
(女)
15、可是世界它们惨的地方还有很多。如果极地冰冠融化,经济发达、人口稠密的沿海地区会被海水吞没,马尔代夫、图瓦卢等低洼岛国将从地面上消失,威尼斯、香港、里约热内卢、东京、曼谷、纽约等海滨大城市以及孟加拉、荷兰、埃及等国也将难逃厄运。
(男)
16、而海洋升温,必定造成更猛烈的飓风、龙卷风、洪水„„从而造成大量的人身伤亡和财产损失
(女)
17、一些令人不堪的传染病也会传播的越来越快!(男)
18、一些疾病将死灰复燃!
(女)
19、乘船将会成为我们唯一的交通方式!
(男)20、看到这些我害怕了!心痛了!叹息了!难道我们真能像青蛙一样慢慢烫死才肯罢休吗?(女)
21、我们该着手了。同学们,让我们一起努力尽一点微薄之力吧!(语气要有号召力)(齐)谢谢!——鞠躬------
到时候,声音大些,胆大语气读出来,放开!加油加油!
第四篇:全球气候变暖影响英文版
1.One of the effects of global warming is the destruction of many important ecosystems.Changing and erratic climate conditions will put our ecosystems to the test, the increase in carbon dioxide will increase the problem.The evidence is clear that global warming and climate change affects physical and biological systems.There will be effects to land, water, and life.Already today, scientists are seeing the effects of global warming on coral reefs, many have been bleached and have died.This is due to warmer ocean waters, and to the fact that some species of plants and animals are simply migrating to better suited geographical regions where water temperatures are more suitable.Melting ice sheets are also making some animals migrate to better regions.This effects the ecosystems in which these plants and animals live.Several climate models have been made and they predict more floods(big floods), drought, wildfires, ocean acidification, and the eventual collapse of many ecosystems throughout the world both on land and at sea.There have been forecasts of things like famine, war, and social unrest, in our days ahead.These are the types of effects global warming could have on our planet.2.Another important effect that global warming will bring is the loss and endangerment of many species.Did you know that 30 percent of all plant and animal species alive in the world today are at risk of extinction by the year 2050 if average temperatures rise more than 2 to 11.5 degrees Fahrenheit.These mass extinctions will be due to a loss of habitat through desertification, deforestation, and ocean warming.Many plants and animals will also be affected by the inability to adapt to our climate warming.Some species will survive though because they will migrate to other parts of the world where they can survive.A good example of that happening is the red fox that has already done it.The red fox used to live mainly in North America, but has migrated now to the Arctic.People like you and me are also in danger, people living in coastal areas will be badly hit if sea levels rise.Desertification will also be a problem for humans, food may become scarce.3.One very disappointing effect of global warming is war and conflicts.With a decline in the amounts of quality food, water, and land, it could bring an increase in global security threats, and war.Take the country Sudan for example, in that region global warming has played an important role.There is conflict in Sudan, global warming is not the only cause, but it has played its part.The roots of the problem in Sudan can be traced back to climate change, and the scarcity of natural resources.The conflict in Sudan started during a time of intense drought.Scientists and military analysts are predicting that climate change and the devastation it causes could bring war and conflict.When sufficient amounts of water and food are running short that is when war can come about.What this brings to light is the fact that ecological crisis and violence are both linked.4.Economic calamities are another effect that global warming could bring.Take hurricane Katrina for example, one thing that climate change does is that it brings us more extreme storms like Katrina.Hurricane Katrina resulted in millions and millions of dollars in damage.When severe storms and floods occur, crops, homes, businesses, and more all fail, and that costs a lot of money, and it hurts the economy.When severe floods occur you also need to make sure that the threat of disease is controlled.Hurrican Katrina resulted in 135$ billion in property damage.That really hurt the economy that year.When severe weather does damage it can also raise the price of insurance, and this hurts the everyday person.Cleaning up a disaster area also costs a lot of money.If too many extreme storms hit in a certain time frame the impact on the economy can be disastrous.5.Drought is an effect of global warming that we are already seeing right now.Many countries are finding that they are currently receiving more storms and rising waters, while other countries are suffering from drought.As the climate of the Earth warms, experts from Scientific American predict that drought conditions could increase by as much as 66 percent.Drought will mean a shrinking water supply and a decrease in crops.Drought can mean a danger for global food production and supply.This also mean that several countries experiencing drought could have a major famine on their hands.Currently, India, Pakistan, and some parts of Africa are already experiencing droughts.It is sad to say but experts are predicting that it will get much worse.One important effect global warming is having on our planet, is that it is producing more intense storms and floods.When you look at the scientific data concerning storms and floods in the last 30 years, you will see that category 4 and 5 hurricanes have nearly doubled in occurence.What many people don't know or realize is that warm waters give hurricanes their strenght and power.Many scientists today are associating the increase in ocean and atmospheric temperatures to the rate of violent storms.Between the years 1905 and 2005 the frequency of hurricanes has been on the rise.From 1905 to 1930 there were an average of 3.5 hurricanes per year, 5.1 between 1931 and 1994, and 8.4 between
1995 and 2005.In 2005 there was a record number of tropical storms that came about, and in 2007 the worst flooding in 60 years hit Britain.More recently, Australia has seen the worst flooding they have had in a long time.6.Heat waves are also an effect of global warming.It is no secret that temperatures are breaking records in the US and Canada and abroad.More extremely hot summer days are in store for North America and elsewhere if global warming continues unabated.Here are some heat waves facts for you: air pollution in urban areas could get worse with the increased heat.This could result in more people having heart attacts, strokes, and asthma attacks.Children, the elderly, poor, and people of color are more vulnerable to the effects of a heat wave.Scientists have confirmed that the frequency and duration of heat waves has definitely increased by a lot over the last 50 years.7.One obvious effect of global warming is the shrinking of glaciers, this is happening wherever there are glaciers worldwide.Mountain glaciers have been in retreat for a long time now as global warming continues to effect us.What many people don't realize though is that it is happening more rapidly now then previously believed.Glaciers don't only recede they also shrink vertically.The lakes this melting produces can also lead to more melting.These lakes are like a cancer that is consuming our world's glaciers.Here is a fact that may surprise you: Even if all the world's mountain glaciers were to melt, the effect on sea levels would be small.However, the disappearance of mountain glaciers would have other impacts on nature aside from raising sea levels.8.Global warming will also bring a rising of sea levels around the world.As glaciers and polar ice sheets melt, the sea levels will rise more and more, and the sea temperatures will also warm.This means more hurricanes, and more flooding due to the rise of the sea level.The Effects of Global Warming Nowadays,our world is becoming hotter and hotter.And we called it“GlobalWarming”which is to describe the rise of temperature.The Global Warming has two sides of effect to the world’s creature.First,the Global Warming means there is more carbon dioxide in our atmosphere.So some plants can grow faster and stronger than before.This is its good effect.But on the other hand,the Global Warming will bring us more disasters than fortune.Because of the more and more carbon dioxide in the atmosphere,the earth’s temperature is rising day by day.The high temperature will cause many serious problems.Like the ice of Antarctica and Arctic Ocean begin to melting.After that happen, the height of sea level will lift.Then some terrible disasters will coming,like tsunami and so on.Maybe some countries,for example like Japan and some coastal cities will be submersed.One reason of Global Warming is that too much industrial emissions and poisonous gases which were made by human beings vented to our atmosphere.Especially methane and carbon dioxide.These gases make the temperature rise day afteerday.And that will cause many natural disasters.Liketsunami,flood, drought and so on.Finally ,if we don’t stop, the world will become a death world without lives.Our fate will like the dinosaurs.Another main reason of Global Warming is the fast growing of
the world’s population.So if we don’t control the speed of growing population,the situation will be worse.So is it already too late to prevent the Global Warming?I think it is still not too late.If we plant more trees,produce less greenhouse gases like methane and carbon dioxide,and to control the growing of population.The situation of Global Warming will be better.And we must to do it first in our daily lives.Go to work by bus or on foot I think,is the best way to prevent the worse situation of Global Warming.全球气温变暖的主要原因: 人类活动对气候变化肯定是有变化和影响的。人类燃烧煤、油、天然气和树木,产生大量二氧化碳和甲烷进入大气层后使地球升温,大气中二氧化碳排放量增加是造成地球气候变暖的根源。
The main reason for global warming: human activities definitely have an impact on climate change.Human burns coal, oil, natural gas which produced a large amount of carbon dioxide and methane, and it warmed the earth.The cause of global warming is the increased carbon dioxide emissions into the atmosphere.造 成的危害:首先是自然生态会发生变化;土地荒漠化,森林退向极地,雨量增加,冬天更湿,夏天更旱,旱涝灾害增加,热带将酷热无比,人类难以生存。其次是两极冰块大面积熔化,使海平面上升,那将使生活在沿海的占世界 1/3的人口无家可归,世界许多港口城市 淹没于一片汪洋之中。
Harms: first, to change the natural ecology;land desertification, forest back to the polar regions, increased rainfall in winter, wetter, more droughts in summer, increased droughts and floods, tropical would be extremely hot, human difficult to survive.Second, the melting polar ice, a large area, so that sea level rise, which will live in coastal areas of the world's 1 / 3 of the population homeless, many of the world port city submerged in a sea of.Harms: first, to change the natural ecology;land desertification, forest back to the polar regions, increased rainfall in winter, wetter, more droughts in summer, increased droughts and floods, tropical would be extremely hot, human difficult to survive.Second, the melting polar ice, a large area, so that sea level rise, which will live in coastal areas of the world's 1 / 3 of the population homeless, many of the world port city submerged in a sea of.由于人类活动的影响,中国的气候在 21世纪将继续明显变暖,其中中国北方冬天的变暖趋势最为明显。
作为对比,过去100年中,中国的升温幅度仅为0.5℃到0.8℃。
由于气候暖干,三江平原湿地资源及生物多样性都将减少,濒危物种增加,大面积沼泽湿地将变成草甸湿地。
长江三角洲附近的湿地,则将受到海平面上升的威胁,导致面积减少,质量下降,潮滩地被淹没和侵蚀。
由于气温上升,导致黄河和内陆河地区的蒸发量可能增长15%左右,北方水资源短缺以及南方的洪涝灾害都将加剧。
温度升高导致冻土融化,也会影响到青藏铁路的安全。
As the impact of human activities, the climate in the 21st century China will continue to significantly warmer, which in winter warming trend in northern China the most obvious.In contrast, over the past 100 years, China's temperature rise of only 0.5 ℃ to 0.8 ℃.As warm and dry climate in the Sanjiang Plain wetland resources and biodiversity will decrease, an increase of endangered species, large areas will become a meadow marsh wetlands.Wetlands near the Yangtze River Delta, will be the threat of rising sea levels, resulting in reduced size, lower quality, tidal inundation and beach erosion.As temperatures rise, leading to the Yellow River and inland rivers of the evaporation may increase about 15% water shortage in northern and southern floods will increase.Lead to permafrost melting temperature, also affect the safety of the Qinghai-Tibet Railway.由于人类活动的影响,中国的气候在 21世纪将继续明显变暖,其中中国北方冬天的变暖趋势最为明显。
作为对比,过去100年中,中国的升温幅度仅为0.5℃到0.8℃。
由于气候暖干,三江平原湿地资源及生物多样性都将减少,濒危物种增加,大面积沼泽湿地将变成草甸湿地。
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长江三角洲附近的湿地,则将受到海平面上升的威胁,导致面积减少,质量下降,潮滩地被淹没和侵蚀。
由于气温上升,导致黄河和内陆河地区的蒸发量可能增长15%左右,北方水资源短缺以及南方的洪涝灾害都将加剧。
温度升高导致冻土融化,也会影响到青藏铁路的安全。
As the impact of human activities, the climate in the 21st century China will continue to significantly warmer, which in winter warming trend in northern China the most obvious.In contrast, over the past 100 years, China's temperature rise of only 0.5 ℃ to 0.8 ℃.As warm and dry climate in the Sanjiang Plain wetland resources and biodiversity will decrease, an increase of endangered species, large areas will become a meadow marsh wetlands.Wetlands near the Yangtze River Delta, will be the threat of rising sea levels, resulting in reduced size, lower quality, tidal inundation and beach erosion.As temperatures rise, leading to the Yellow River and inland rivers of the evaporation may increase about 15% water shortage in northern and southern floods will increase.Lead to permafrost melting temperature, also affect the safety of the Qinghai-Tibet Railway.人们过去一向认为,多种植树木有助于减缓全球气温升高的现象。不过,科学家如今指出,如果地球气温再升高 2摄氏度,森林反而可能成为二氧化碳的净排放来源。植物会吸收也会排放二氧化碳;健康的森林,尤其是热带地区的森林所吸收的温室气体,会比它们排放的来得多。不过,如果这些森林受到破坏、生病或是死亡,蓄积在这些森林里的二氧化碳就会被释放出来。
人 类砍伐森林时进行的焚烧和摧毁所释放的温室气体,占了总碳排放量的 20% 森林可吸收四分之一的总碳排放量,随着它们日益消失,或是成为净排放来源,空气中的二氧化碳将大幅度增加。”
People used to always think that, more than planting trees help slow global warming phenomenon.However, scientists have now pointed out that if global temperatures rise another 2 degrees Celsius, the forest but it may become a net carbon dioxide emission sources.Plants absorb carbon dioxide emissions will be;the health of forests, especially tropical forests absorb the greenhouse gas emissions than they are to much.However, if these forests are destroyed, illness or death, accumulation of carbon dioxide in these forests will be released.When human burning of deforestation and destruction of the release of greenhouse gases, of the total carbon emissions by 20% of the forest can absorb a quarter of the total carbon emissions, as they increasingly disappear, or become a net source of emissions, carbon dioxide in the air will increase significantly.从 以上分析可以看出,影响气候变化的因素极其复杂,天体运行和地球运动的威力比人的影响不知要大多少倍,它可以使天气变热,也能让地球变冷。而人的力量在大自然面前显得非常渺小,连一场台风吹来也只有躲避的份儿,大自然的力量是根本抗御不了的。肆无忌惮地糟践自然,人类必然会受到严厉惩罚。人 类应该尽一切努力,去做好应该也能够做好的事情。大力发展低碳经济已经成了国际社会的共识。
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Can be seen from the above analysis, impact of climate change in the extremely complex, and the earth movements of celestial bodies than the human impact unknown power be many times greater, which can make the weather Bianre, Ye make the earth cooler.The power of people in front of it is very small in nature, with a typhoon blowing only escape to but is the fundamental forces of nature can not resist.Brazenly insulting nature, mankind will inevitably be severely punished.Man should make every effort to do a good job should also be able to do things.To develop low-carbon economy has become the consensus of the international community.从 以上分析可以看出,影响气候变化的因素极其复杂,天体运行和地球运动的威力比人的影响不知要大多少倍,它可以使天气变热,也能让地球变冷。而人的力量在大自然面前显得非常渺小,连一场台风吹来也只有躲避的份儿,大自然的力量是根本抗御不了的。肆无忌惮地糟践自然,人类必然会受到严厉惩罚。人 类应该尽一切努力,去做好应该也能够做好的事情。大力发展低碳经济已经成了国际社会的共识。
Can be seen from the above analysis, impact of climate change in the extremely complex, and the earth movements of celestial bodies than the human impact unknown power be many times greater, which can make the weather Bianre, Ye make the earth cooler.The power of people in front of it is very small in nature, with a typhoon blowing only escape to but is the fundamental forces of nature can not resist.Brazenly insulting nature, mankind will inevitably be severely punished.Man should make every effort to do a good job should also be able to do things.To develop low-carbon economy has become the consensus of the international community.全球变暖会使我们没有冬天。“四季少了夏和冬”绝对不是好事。全球变暖是指全球气温升高。近100多年来,全球平均气温经历了冷-暖-冷-暖两次波动,总得看为上升趋势。进入八十年代后,全球气温明显上升。1981~1990年全球平均气温比100年前上升了0.48℃。导致全球变暖的主要原因是人类在近一个世纪以来大量使用矿物燃料(如煤、石油等),排放出大量的CO2等多种温室气体。由于这些温室气体对来自太阳辐射的短波具有高度的透过性,而对地球反射出来的长波辐射具有高度的吸收性,也就是常说的温室效应“,导致全球气候变暖。全球变暖的后果,会使全球降水量重新分配,冰川和冻土消融,海平面上升等,既危害自然生态系统的平衡,更会威胁到人类的食物供应和居住环境。
Global warming would we have no winter.”Summer and winter seasons less" absolutely not a good thing.Global warming refers to i ncrease in the global climate.Nearly 100 years, global average temperature through the coldcoldthe Earth.
第五篇:评课稿
评课稿
千阳县启文小学 李红荣
尊敬的各位老师:
大家下午好!
本周在学校的安排下,我听了四位年轻漂亮的老师的精彩课堂展示,使我受益匪浅,但由于时间关系,我只谈谈自己听了赵静老师和王瑞平老师的收获。
听了一(3)班的赵静老师这节课,给我感受最深的就是赵老师人年轻,漂亮,驾驭课堂的能力更漂亮,让人佩服。值得我学习的地方很多。例如本节课教师先从学生熟悉的打扫卫生情境图引题,请学生认真观察,说说你发现了什么,这个问题既熟悉又简单,学生们跃跃欲试,积极性立刻被调动起来了。老师又及时准确的表扬了回答问题的学生,学生的兴趣更浓了,没有得到回答问题的学生有些失望,紧接着老师又说:“今天学习新知识时,大家表现好的都可以得到你想要的幸福成长卡”,更加激化了学生学习新知识的兴趣,活跃了课堂气氛。赵老师还采用了多媒体的教学手段手,创设教学情境很直观、形象,符合学生的年龄特点,又能吸引学生的注意力。效果特别好。
听了一(1)班王瑞萍老师的这节课,给我感触最深的是王老师在传统教学风格的基础上,添加了很多新的元素。注重强化知识点的训练,能力的培养,注重对学生情感的熏陶,同时又注重和学生间的平等对话,通过教师个人的人格魅力和深高的教学素养把整节课演绎的十分精彩。例如王老师在0的认识教学中,通过理解0的两种意义,让学生寻找生活中的0,教学0的写法,0的加减法几个环节向我们呈现了一节优秀的常规课。先不说课本身的好坏,就看班级五十多孩子在课上的表现,就可以看出老师对孩子训练有素。即使是后排的孩子离老师比较远也能把小手放好不乱动,真的很不容易。因为一年级的小学生在开学一个多月这么短的时间内,就能帮助孩子养成这么好的习惯的确很难做到。还有王老师在教学过程中始终盯着每一个孩子,观察他们的听课状态,并及时提醒注意力不集中的孩子,让每个孩子都能专心听课。教师语言具有亲和力,声音不大不小,听起来特别舒服,值得我学习。
通过本次活动,我觉得我们应该在以下两方面注意些:
1、在课堂中教师要少让学生齐声回答问题。在平时的课堂中学生齐声回答问题的现象比较多。我认为这样不好,因为一般回答问题的学生都是中等生或学优生,这样的回答听起来热闹,但其实是放弃了中下学生和学困生,这些学生本来就习惯不好,基础差,懒予动脑,如果老师只让学生齐声回答,他们就会只看热闹。我认为,教师应多让学生个别回答问题,简单的问题让中下学生或学困生回答,并对于他们的点滴进步及时表扬,这样既能强迫了他们学习,又可以让他们体会到学习的快乐,还可增强他们学习的兴趣。
2、在课堂中教师和学生要互动。
互动这一课堂教学理念并不是新生事物,而是自古就有的。无论是中国古代孔子与弟子的座谈还是古罗马教育家昆体良提出的“教是为了不教”都或多或少的在形式和内容上成为“师生互动”的先导。要使“师生互动”这一理念真正内化到课堂教学方式中,我们必须明白不仅要教给学生知识还要教给学生获得知识的方法。教师在课堂上的角色就不能是单纯的给与者,而应该是获取方法的引导者。所以,在课堂教学中开发学生大脑智力因数、引导学生学习思维更要求师生间有充分的交流与合作,因而, 在课堂中教师和学生要互动,这样才能调动学生学习的兴趣,达到事半功倍的效果。
总之,本次教研活动我的感触很深,我觉得讲台就是教师的舞台,这个舞台不一定多么豪华,台下也不一定有观众和掌声,只要有孩子们,有我们不断地耕耘,那么这个舞台就一定是最绚丽的!在以后的工作中,我一定会虚心向年轻人请教,不断努力地学习、钻研,使自己的课堂真正显示出实效性。