Man and His Environment(人和环境)

throughouthistorymanhaschangedhisphysicalenvironmentinordertoimprovehiswayoflife.withthetoolsoftechnologyhehasalteredmanyphysicalfeaturesoftheearth.

hehastransformedwoodlandsandprairiesintofarmsandmadelakesandreserviorsoutofriversforirrigationpurposesorhydroelectricpower.manhasalsomodifiedthefaceoftheearthbydrainingmarshesandcuttingthroughmountainstobuildroadsandrailways.

however,manschangestothephysicalenvironmenthavenotalwayshadbeneficialresults.today,pollutionoftheairandwaterisanincreasingdangertothehealthoftheplanet.eachdaythousandsoftonsofgasescomeoutoftheexhaustsofmotorvehicles.smokefromfactoriespollutestheairofindustrializedareasandthesurroundingareasofthecountryside.thepollutionofwaterisequallyharmful.thewholeecologicalbalanceoftheseaisbeingchangedandindustrialwasteshavealreadymademanyriverslifeless.

nowenvironmentalprotectionismorepressingthaneverbefore.asweknow,massivedestructionofenvironmenthasbroughtaboutnegativeeffectsandevenposesagreatthreattomansexistence.indifferencetotheseproblemswillmeancommittingsuicide.therefore,effectivemeasuresshouldbetakenandlawspassedtoconserveenvironment.otherwise,maniscertaintosufferfromtheseriousconsequencescausedbythislackofcareforhislivingsurroundings.