ENVIROMENT

　　Theenvironmentmeanssurroundingsinwhichpeople,animalsandplantsdevelopandexist.Ecologyisabranchofbiologywhichinvestigaterelationshipsbetweenlivingbeingsandtheirenvironment

　　Themostseriousecologicalproblemsoftodayarethepollutionofair,waterandsoil,thedestructionofecosystem,disappearanceofmanyspeciesofanimalsandplants,theweatherchanges,acidrains,thewarmingupoftheEarth抯surface,thedestructionoftropicalrainforestsandthebreakingoftheozonelayer.Thesedamagesarecausedbythemanhimselfandhistechnicalprogress.

　　Pollution:Weneedairtobreathe,watertodrinkandfoodtoeat,butthereisagrowingnumberofpeopleintheEarthsothatwehavetosharetheseeverythingwithmorepeople.Thegrowingnumberofcarscontributemuchtotheairpollution.Factoriesproducealargeamountofcarbondioxide,leadpoisonsetc.whichgetintotheair.Someofthemincombinationwithwatermakesulfuricacidintheclouds,itlaterfallsasacidrainwhichkillstreesandmakesoilinfertile.factoriesalsopolluteriversbecausetheyputtheretheirchemicalwaste.Alsofarmerspollutethesoilusingalotofpesticidesandfertilizers.Thispollutioncanalsopoisongroundwater.Ithinkthatthebestwayhowtoreducepollutionisreducing,reusingandrecycling.

　　Greenhouseeffect:Inthelast100yarstheEarth抯surfacehaswarmedupbymorethanhalfadegree,thischangecouldcauserisingthesealevelsbyuptooneandhalfmetersbytheyear2030.TheGreenhouseeffectiscausedbypollutedatmospherewhichwaspollutedbycarbondioxidefromfossilfuelsandchlorofluorocarbons.

　　Thebestprotectionistostopproducingthesegasesanddestroyingrainforests.Itisworthreplacingoldpowerplantswithnuclearpowerwhichreducethedamage.Alsonuclearpowerhasitsdisadvantages,inthiscasethereaealternativesourcesofenergy:hydropower,solarpower,geothermaletc.

　　OzoneHole:Theozonegapisthinningatarapidspeed.ItisalayerwhichprotectusfromdangerousUVrays,thesecoulddamagethelifeontheEart