问题标题:
【Theabilityofforeststoabsorbman-madeCO2isweakeningaccordingtoananalysisoftwodecadesofdatafrommorethan30sitesinthefrozennorth.ThestudywasconductedbyateamofCanadianChineseandEuropeanresearchersand】
问题描述:

Theabilityofforeststoabsorbman-madeCO2isweakeningaccordingtoananalysisoftwodecadesofdatafrommorethan30sitesinthefrozennorth.

ThestudywasconductedbyateamofCanadianChineseandEuropeanresearchersandpublishedinthesciencejournalNatureonJanuary3.ThefindingsmeanthatmoreoftheCO2wereleasewillendupaffectingtheclimateratherthanbeingsafelylockedawayintreesorsoil.

AsplantstakeupmoreCO2thatshouldputabreakonCO2increasesscientistsoncethought.Howeverthenewdatasuggestthatthisideaistoosimplified.Theresearchteammonitoredthedateinautumnatwhichtheforestsswitchedfrombeinganetsinkforcarbonintoanetsource.Insteadofmovinglaterintheyearastheyhadexpectedthisdateactuallygotearlier—insomeplacesbyafewdaysbutinothersbyafewweeks.

"Thismeanspotentiallyabiggerwarmingeffect"saidTimoVesalaiwholedthestudy.Thepreciseeffectthetrendwillhaveonfuturewarmingishardtopredict.ButtheresearchcouldpartlyexplainwhytheamountofCO2intheatmosphereisincreasingfasterthanexpected.

Currentlyhalfoftheman-madeCO2isabsorbedbyoceansandecosystemsonland.

Between1970and2000theCO2concentration(浓度)intheatmosphereroseby1.5ppm.Since2000theannualriseleaptoanaverageof1.9ppm—35%higherthanexpected.

InChinatheaveragetemperaturein2007was1.3℃higherthantheaveragetemperaturebetween1970and2000.

Soitistimeforustotakeactionnow.

1.Thewholepassageisintendedtotellusthat_________.

A.theaveragetemperatureisgettinghigher B.treesaretakinginlessCO2

C.theairisbecomingworseandworse D.theecosystemsonlandareharmful

2.Whatdoesthethirdparagraphmainlytellus?

A.PlantstakeupmoreCO2. B.Winterbecomeslaterwithspringearlier.

C.ForestsabsorblessCO2. D.PlantscanblockCO2increases.

3.Withwinterstartinglaterandspringearlierscientistsoncethought_________.

A.Plantswouldgrowbetterwithmoresunshine

B.Treeswouldsoakup

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《【Theabilityofforeststoabsorbman-madeCO2isweakeningaccordingtoananalysisoftwodecadesofdatafrommorethan30sitesinthefrozennorth.ThestudywasconductedbyateamofCanadianChineseandEuropeanresearchersand】|小学英语问答-字典翻译问答网》
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