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1、Unit8Unit8HumanandnatureChinaisoneofthe12countrieswithrichestbiodiversityintheworld,withthevarioustypesofterrestrialecosystems,thetopnumberofspeciesinthenortherncountries.Itisoneofthefourmajorgeneticresourcescentersoforiginintheworld我国是世界上生物多样性最丰富的12个国家之一，拥有
2、陆地生态系统的各种类型，物种数量居北半球国家第一，是世界四大遗传资源起源中心之一。Althoughinthepossessionofrichbiodiversityresources,Chinafacesbigpressureofspeciesprotection.Accordingtothe<>publishedin2003bytheInternationalUnionforConservationofNatureandNaturalResources(
3、IUCN),thereare422speciesarethreatenedwithextinctioninChina,including81kindsofmammals,75kindsofbirds,46kindsoffish,31kindsofreptilesand184kindsofplants.然而，在占有丰富的生物多样性资源的同时，中国面临的物种保护压力也是相当艰巨的，根据国际自然与自然资源保护联盟2003年公布的《濒危物种红色名录》，我国有422个物种面临灭绝的威胁，其中哺乳动物81种、鸟类75种、鱼
4、类46种、爬行动物31种、植物184ThewildanimalsandplantsfacingextinctioninourcountryThewildanimalsandplantsfacingextinctioninourcountryThewildanimalsandplantsfacingextinctioninourcountry.Manyfactorsactingtogethercontributetothelossofbiodiversity1introductionofforeigninvasi
5、vespeciesTheytakeupthespaceoflocalanimalsandplants,competewiththemforthenutrient,makethemextinction,destroythebiologicaldiversity.Theyreleasechemicals,inhibitthegrowthofotherspecies,andfinallydestroytheecologicalsystem2ExcessivehuntinganddeforestationTopursu
6、itofeconomicinterests,peoplekillalotofanimals,deforestation,destructtheirhabitat,andresultsinsoilerosion..3SevereenvironmentalpollutionWiththedevelopmentofscientificandtechnologicallevelandtheimprovementofpeople'slivingstandards,theenvironmentalpollutionisin
7、creasing,includingairpollution,waterpollutionandnoisepollution,whichleadtothegreenhouseeffect,acidrain,ozonedepletionandetc.Thegrowingenvironmentpollutionmadetheanimalsandplantsdestructed..avarietyoforganismsisavaluableassettoallmankind.Biodiversityprovidesp
8、eoplewithrichfoods,medicines,fuelandothernecessities,aswellasalargenumberofindustrialrawmaterialsforhuman’ssurvivalanddevelopment.Biodiversitymaintainstheecologicalbalanceofnature,providesagoode
