高中英語選修六unit4-reading-pp課件

Unit4GlobalWarmingReading1ppt課件

leadinCanyouthinkofsomenaturaldisasters(自然災(zāi)害)becauseoftheextremeheat(酷暑)?2ppt課件drought(旱災(zāi))3ppt課件fire4ppt課件TheEarthisBecomingWarmer--ButDoesItMatter?地球在變暖——要不要緊？Reading5ppt課件Wordsandexpressionstemperature溫度onedegreeFahrenheit華氏一度explore探索humanactivities人類活動phenomenon現(xiàn)象subscribeto同意，贊成fossilfuels礦物燃料byproduct副產(chǎn)品“greenhouse”gases溫室氣體atmosphere大氣methane甲烷，沼氣degreeCelsius攝氏度quantitiesof大量的accuratemeasurements精確的測量data資料，數(shù)據(jù)catastrophe大災(zāi)難beopposedto反對environmentalconsequences環(huán)境影響agreatrangeof大量的evenif即使keepon繼續(xù)6ppt課件

ScanningWho

：_____________Threescientists:____________________________

SophieArmstrongDrJaniceFoster;CharlesKeeling;GeorgeHambley;7ppt課件Whatarethetwographsabout?Graph1showsthetemperaturedifference(溫度差異)from1860to2000.Graph2showsthecarbondioxidecontent(二氧化碳含量)intheatmospherefrom1957to1997.Graph1:Graph2:8ppt課件CarefulReading9ppt課件Paragraph1Paragraphs2&5Paragraph6Part1Part2Part4MainideaofthetextPart3Paragraph7Howglobalwarmingcomesabout?(全球變暖是怎樣產(chǎn)生的)Twodifferentopinionsaboutglobalwarming.Theearthisbecomingwarmer.Shouldwedoanything?10ppt課件Duringthe20thcentury,thetemperatureoftheearthdidn’tseemtoincreasemuch.2.Thereisnodoubtthatglobalwarmingiscausedbythehumanactivities.3.Notallscientistsbelievethattheincreaseintheearth’stemperatureisduetotheburningoffossilfuels.Trueorfalse

11ppt課件4.Thelevelsofcarbondioxidehaveincreasedgreatlyoverthelast100—150years.5.GeorgeHambleybelievesthatglobalwarmingwilldogoodtotheearth.6.Weknowtheeffectsofglobalwarming.12ppt課件Howhasglobalwarmingcomeabout(產(chǎn)生)?1.Humanactivity

Theproblembeginswhenhugequantitiesofextracarbondioxide(大量的二氧化碳)areaddedintotheatmosphere.…isduetotheburningoffossilfuels…2.

GreenhousegasesParagraph2&313ppt課件carbondioxideFossilFuel(礦物燃料)coaloilgasglobalwarming●●●●●●produce二氧化碳14ppt課件Haveyoueverseenagreenhouse?15ppt課件Methane['mi:θein]

WhatareGreenhousegases?Therearegasescalled“greenhousegases”,including…CarbondioxideWatervapourTheytraptheheatfromthesunandwarmtheearth.16ppt課件Para4.thelevelsofcarbondioxidehaveincreasedgreatlyoverthelast100to150yearsWhomadeaccuratemeasurementsoftheamountofcarbondioxide?2.Howmuchhasincreased?CharlesKeelingThecarbondioxideintheatmospherewentupfromaround315partstoaround370partspermillion.17ppt課件Para5.Howhighwillthetemperaturego?Theamountofwarmingcouldbeaslowas1to1.5degreesCelsius,butitcouldbeashighas5degrees.18ppt課件Dr.Foster:_____________________GeorgeHambley:_________________Whatdothescientiststhinkaboutglobalwarming?Dotheyagreewithoneanother?Itwouldbeacatastrophe.weshouldnotworryaboutit.Theyhavequitedifferentattitudestowardsthisissue.Paragraph619ppt課件Doesglobalwarmingmatter?Positiveeffects（正面影響）

Negativeeffects(負面影響）20ppt課件causethesealeveltoriseseverestormsfloodsdroughtsfaminesthespreadofdiseasesdisappearanceofspeciesPositiveeffectsNegativeeffects21ppt課件Thesealeveltorise.22ppt課件Severestormsdroughtsfaminesthespreadofdiseases23ppt課件disappearanceofspecies24ppt課件causethesealeveltoriseseverestormsfloodsdroughtsfaminesthespreadofdiseasesdisappearanceofspeciesPositiveeffectsNegativeeffectsmakeplantsgrowquickercropswillproducemoreagreaterrangeofanimalsmakelifebetter25ppt課件Summary

HowEffects

26ppt課件1.Humanactivities2.GreenhousegasesCarbondioxide27ppt課件Homework1.R