Global Warming

BackgroundInrecentyears,globalwarmingismentionedmoreoftenbyscientists.Itcausesmanyproblemsandaffectspeople’snormallife,nowhasbecomeoneoftheworstproblemsconfrontinghumanbeings.GlobalwarmingistheincreaseintheaveragetemperatureoftheEarth'snear-surfaceairandoceanssincethemid-20thcentury.Globalwarmingisaperiodoftime,theearth'satmosphereandoceantemperaturesphenomenon,ismainlyreferstoman-madetemperaturetorise.Thecurrentworldrangethatthemainreasonisquitelikelytheduetogreenhousegases(carbondioxideonbehalfofgasemissionscausedbytoomuch.Nearly100years,theaverageglobaltemperatureexperienced:cold,warmandcoldandwarmfourwave,intheoveralllookatthetemperatureforarisingtrend.Intheeightys,globaltemperaturerisesignificantly.Whatisglobalwarming?Withthedevelopmentofeconomy,moreandmoregreenhousegasesarebeingdischargedintotheair.CO2makesupabout70%ofthegreenhousegases,whichisconsideredtobeoneofthegreatestcausesofglobalwarming.全球变暖指的是在一段时间中，地球大气和海洋温度上升的现象，主要是指人为因素造成的温度上升。目前世界范围内认为主要原因很可能是由于温室气体（代表气体二氧化碳）排放过多造成。近100多年来，全球平均气温经历了：冷→暖→冷→暖四次波动，总的看气温为上升趋势。进入八十年代后，全球气温明显上升。工业废气的排放Themainreasonistheexcessivecarbondioxideemissions.PlantdamageTheeffectsofglobalwarmingcanhavemanyunforeseensideeffects.全球变暖带来许多不可预料的影响。Whereismyhome?Asthetemperaturerise,theearth‘spoles(极点)islandfatesnowmeltcanleadtorisingsealevels,manyislandswillbedrowned,someislandmaynotexist.咦！这冰怎么就慢慢融化了呢？看来此地不宜久留呀！iftheearth'saveragetemperature4degreesCelsius,theworldwillhavemorethan30millionpeoplewatershortages.如果地球平均气温上升4摄氏度，全球就会有30多亿人面临缺水问题。Wecanusemorecleanenergysources,suchaswind,solar,etc.Ifeveryfamilycanuseenergy-savinglamps,andsowillsavemoreresources.Weshouldplanttreesalot,becausethegreenplantscanchangecarbondioxideintooxygen.Letusstartfromnow,saveenergyandprotecttheenvironment,protectoursurvivalhomeland.