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environmentalproblemsarebecomingmoreandmoreseriousallovertheworld.forexample,carshavemadetheairunhealthyforpeopletobreatheandpoisonousgasisgivenoffbyfactories.treesonthehillshavebeencutdownandwastewaterisbeingpouredcontinuouslyintorivers.furthermore,whereverwegotoday,wecanfindrubbishcarelesslydisposed.pollutionis,infact,threateningourexistence. theearthisourhomeandwehavethedutytotakecareofitforourselvesandforourlatergenerations.fortunately,moreandmorepeoplehaverealizedtheseproblems.