感恩演讲稿——感恩敬孝,回报社会
2020-03-02 17:27:17 来源：范文大全收藏下载本文
应对气候变化 我们不断努力
在刚刚过去的炎热暑期里，也许你一直在暗暗庆幸：还好我们有空调。但是你可知道，一直以来，全球气候正在默默改变着，随着温室效应的加重，其带来的全球气候变化将可能严重影响人类赖以生存的地球环境。千万别以为，只要有空调，只要启动小小的遥控器就能畅享清凉惬意，如果全球气候真的发生可怕的改变，人类又到哪里去寻找地球的“空调”，去寻找维持我们生命的温度呢？
全球气温为什么会变暖？
科学界普遍认为，气候变暖的原因是由于二氧化碳等温室气体增多，从而导致温室效应加剧。我们所居住的地球，被一层由二氧化碳等气体组成的大气所包围着。这层大气就像一层厚厚的玻璃，把地球变成了一个大暖房。这层玻璃对地球生命至关重要。它降低了太阳辐射强度，减弱地面反射能力，从而使夜晚变暖，日夜温差减小，将地球变为各种生物的乐土。 如果没有大气，地表平均温度就会下降到-18℃，而现在实际地表平均温度为15℃，这就是说温室效应使地表温度提高33℃。适度的温室效应有利于人类生存，但如果温室气体浓度过大，势必造成地表温度提高过多，最终带来全球气候变暖。科学家通过研究发现，近五十年来，地表温度急剧上升，上升的幅度之大是650万年来从没有过的。这是因为人类工业生产造成大量温室气体进入大气，让大气这层“玻璃”不断变厚，从而让地球的反射能力进一步减弱,导致地球温度的提高。
气候变化给人类带来了什么？
随着人口的急剧增加，工业的迅速发展，能源燃料的需求不断升级，排入大气中的二氧化碳还在不断增多；又由于森林被大量砍伐，大气中应被森林吸收的二氧化碳没有被吸收，温室效应也相应不断增强。据分析，十八世纪中叶工业革命前后，二氧化碳浓度只有大约百万分之二百八十，而到2000年，已经上升到了百万分之三百六十。
据联合国的报告指出从19世纪末以来的百年间，由于全球平均气温上升了0.3℃-0.6℃，因而全球海平面相应也上升了10-25厘米。地球干旱、沙漠化， 及其带来的沙尘暴；冰川融化、岛屿消失以及印度洋海啸等等灾难的不断发生，都为人类敲响了警钟。
We Are Striving to Addre Climate Change
It’s hard to imagine how we could live without air conditioner in the hot summer.Unfortunately, the more terrible thing could happen if we hadn’t decreased the greenhouse effect and coped with the global warming.Now it is neceary for us devote more effort to protect our planet, which will offer a big “air-conditioner” to help you and your families free from the hot summer forever.
Why global temperature is climbing
According to experts, the reason for climate warming is intensifying greenhouse effect that is aroused by the increase of CO2 and other greenhouse gaes.The earth
we live on is surrounded by atmosphere composed of CO2 and other gases.This atmosphere is like a thick gla to turn earth into a big warm house.Being vital to lives on the earth, the gla reduces solar radiation intensity and ground reflection ability, warms up nights and decreases temperature difference between days and nights, making the earth a paradise for all kinds of creatures.
If there is no atmosphere, average temperature of the earth’s surface will drop down to -18℃.But the present average temperature is 15℃, which means temperature of the earth’s surface will jump 33℃ due to greenhouse effect.Moderate greenhouse effect is beneficial for human; however, if greenhouse gaes are too concentrated, the temperature of the earth surface will increase too much and finally brings global climate warming.Scientists have found out that the past 5 decades saw a dramatic climbing in temperature of the earth’s surface whose pace tops the record for the past
6.5 million years.This is because man’s industrial production releases vast amount of greenhouse gaes into the atmosphere and make the “gla” thicker and thicker, further weakening the earth’s reflection capacity and boosting up the earth’s temperature.
What climate change brings to human being
With dramatic increase of population and rapid development of industry, demand of energy sources is upgrading and CO2 releasing into the atmosphere is increasing; with chop-off of a large number of forests, CO2 is not absorbed by forests, as a result, greenhouse effect is correspondingly enhanced.It is analyzed that carbon dioxide concentrations have risen from an estimated 280 parts per million (ppm) before the industrial revolution, to 360 ppm today.
Report of UN points out that during the last century as the earth’s surface temperature rose by about 0.3℃-0.6°C, the sea level rose 10-25cm correspondingly.The likely effects of global warming including a greater frequency of extreme weather
conditions: droughts, desertization, sandstorm, glacier melting, islands disappearing and Indian Ocean Tsunami, all strike the alarm for human beings.
感恩演讲稿：怀着感恩的心面对一切与感恩演讲稿：感恩敬孝,回报社会
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