Judyiscollectingsomefactsforaclassprojectonpollution

　　SheisinterviewingDoctorRay,ascientist,abouttrees.

　　JUDY:Whyareyousointerestedintrees,DoctorRay?

　　DRRAY:They’rethebiggestandoldestlivingthingsonearth,Judy.

　　JUDY:Yes,butwhatgoodaretreesTheymakestreetsmorebeautifulandlessnoisy,

　　butwhatelsecantheydo

　　DRRAY:Well,there’swoodinyourpencilandthebench,rubberontheendofyour

　　pencil,andpaperinyournotebook-allfromtrees.And

　　whileyou'restudyingathome,doyouliketoeatanorange,orsipaCoke

　　oracoffee

　　JUDY:Sometines.

　　DRRAY:Well,thefruit,thenutsfortheCoke,andthebeansforthecoffeeallcome

　　fromtrees.And,Isupposeyoualsoenjoybreathingpure,coolair.

　　JUDY:Ofcourse.

　　DRRAY:Thenyoumustthanktreesforthat,too.Treesarenaturalair,andrelease

　　oxygenintotheair.Howmanypeoplearethereinyourclass,Judy

　　JUDY:Forty-six.

　　DRRAY:Well,oneandahalfhectaresofstreescouldproduceenoughoxygento

　　keepyourwholeclassaliveandhealthyforayear.

　　JUDY:That'swonderful!

　　DRRAY:Treescooltheairaswellascleanit.Threetreescandothejobof15air

　　conditionersrunningalmostallday.

　　JUDY:Youcertainlyknowalotabouttrees,DoctorRay.

　　DRRAY:Thankyou,Judy,butIdon't,really.Scientistsareonlynowbeginning

　　tounderstandthem.Forexample,didyouknowthatwheninsectsattack

　　atree,itcanwarnitsneighboursThetreescanthenprotect

　　thenmselvesbyproducingachemicalthatmakestheirleavestaste

　　nasty.Andsometreescanjointheirrootstogetherunderground,and

　　passfoodandwateraround.Treesarecommunicatingwithoneanother,

　　butwedon'tknowhow.

　　JUDY:Aretreesindanger

　　DRRAY:Ingreatdanger.Wecutdownandburnmillionseveryyearbutwe

　　replacehardlyanyofthem.Wearedestroyingourbestfighters

　　againstpolluting.