Twooutofeveryfivespeciesontheplanetthathavebeenestimatedbyscientistsfaceextinction.ThisfigurecomesfromthelatestWorldConservationUnionRedListofEndangeredSpeciespublishedthisweek.
Inall16119animalandplantspeciesareindangerofextinction.“Fromthepoles(地球的两个极点)tothedesertspecieslossisincreasingnotslowingdown”saysIUCNdirector-generalAchimSteiner.Themaincauseaseverispeoplebothdirectlyandindirectly.Whilehuntingandhabitat(栖息地)losscontinuetohaveaseriouseffectonspeciesnumbersglobalwarmingisanotherthreat.
Inthepolarregions(极地)，thesummerseaicethatpolarbearsdependonisrapidlydisappearingandthelatestestimatessuggestthattheicewillbereducedatleastbyfiftypercentinareaoverthenextcentury.AlthoughpolarbearsarestrongswimmersyetlargenumbersofthemwillstarveordrownasglobalwarmingmeltstheArctic’sicesheets.Theworld’sdesertsmaybeexpandingbuttheanimalsthatliveinandaroundthemarenotfaringwell.It’sparticularlydifficultfortheendangeredspeciesoftheextremehabitattorecovertheirnumbers.Meanwhileourincreasingdemandforfishandwaterisplacingthespeciesinriversandoceansingreatdanger.Asshallow-waterfishstocksgetreducedfishermen’sdroppingnetsandlinesintodeeperwatersaretakingtheirtollonspeciesthere.
“Thistrendcan’tbestopped.Environmentalistsalonecannotsavetheworld’sspeciesindanger”saysSteiner“butconservation(保护)canwork.Itmustbecometheresponsibilityofeveryonetoact”.
1Allthefollowingstatementsarethecausesofanimalextinctionexcept______.
A.Onlythespeciesofthepolesanddesertsarefacingextinction.
B.Asaresultoftheglobewarmingpolarbearswillgetmorefood.
C.Fishermen’sfishingindeepoceansincreasesthetollofspecies.
D.Itwillnottakealongtimeforspeciesofextremehabitattorecovertheirnumber.
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