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1、Greenhouse Effect,主讲人：晨景-赵PPT：开放-张,Definition,The greenhouse effect is a process by which thermal radiation from a planetary surface is absorbed by atmospheric greenhouse gases,and is re-radiated in all directions.,Wordsthermal:ml adj.热的，热量的 n.上升暖气流planetary plnitriadj.行星的,Since part of this re-radi
2、ation is back towards the surface and the lower atmosphere,it results in an elevation of the average surface temperature above what it would be in the absence of the gases.,Wordselevation,elivein n.高地；海拔；提高；崇高；正面图,Causes,Large Population,Industry,Forests Keep Disappearing,Explanation,Effects,Tempera
3、ture,Aworldwidegreenhouseeffectmightproduce adangerouslywarmerworld.Sincethelate19thcentury,theaverageglobal temperaturehasincreasedbetween 0.3Cand0.6C.Internationally.,Estimatesofglobalaveragetemperatures haveprojected an increase of as much as5 before the year 2100.,However,itwouldalsomeanthatsome
4、 countrieswhicharefurthernorthwouldbeabletogrowcropstheyhadneverbeen abletobefore.,Rising Sea Levels,Theotherseriousworryisthatrisingsea levelsfromthemeltingofthepolaricecapscouldseverelyfloodmanycountries.Ariseinsealevelsofone meter,whichmany experts are predicting by the year 2100,would flood 15%of Egypt,and 12%of Bangladesh（孟加拉）.TheMaldives（马尔代夫）in the Indian Oceanwouldalmostcompletely disappear.,Thank you!,
