绿色中国英语说绿色中国英语说 (17).ppt

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1、Clean Waters and Green Mountains5.1 The cycling of matterGreen ChinaGreen ChinaObjectivesLearn about cycles of matter01Be familiar with the concept of LCA02Cycle of MatterUnlike the one-way flow of energy,matter is recycled within and between ecosystems.Elements that pass through from one organism t

2、o the other in closed loops is called biogeochemical cycles.Types of Biogeochemical cyclesBiological 01Geological 02Chemical 03Physical04lBiological Natural biological processes consist of any and all activities performed by living organisms.lGeological Geological processes include volcanic eruption

3、s,the formation and breakdown of rocks,and major movements of matter within and below the surface of the Earth.lChemical and Physical Chemical and Physical processes include the formation of clouds and precipitation,the flow of running water,and the action of lightning.Renewable VS NonrenwableSome c

4、ycles process elements quickly,on the scale of a human lifetime or less,and result in renewable resources.Nonrenewable resource cycles,however,take much longer,operating on geological timescales.such as millions of years.lExchange Pool A component of a biogeochemical cycle that holds an element for

5、a short period of time.For example,the atmosphere is an exchange pool for water.It usually holds water(in the form of water vapor)for just a week or two.lReservoirA component of a biogeochemical cycle that holds an element for a long period of time.For example,the deep ocean is a reservoir for water

6、.It may hold water for thousands of years.The role of human activitiesHuman activities also play a significant role in biogeochemical cycles.A broader concept of cycles of matter would be the life cycle of human activities such as manufacturing a commercial product or providing commercial services.m

7、ining for raw materialsburning of fossil fuelsclearing of landLCA is a modelling tool to assess environmental impacts related to a product during its entire lifespan:from raw material extraction through processing,manufacturing,distribution,use,and disposal or recycling.LCA can analyze and quantify

8、all emissions to the atmosphere,water bodies and soil,in order to estimate their potential impacts on human health,global warming and climate change,ecosystem quality,and resources depletion.Life Cycle AssessmentLCA is a modelling tool to assess environmental impacts related to a product during its

9、entire lifespan:from raw material extraction through processing,manufacturing,distribution,use,and disposal or recycling.LCA can analyze and quantify all emissions to the atmosphere,water bodies and soil,in order to estimate their potential impacts on human health,global warming and climate change,e

10、cosystem quality,and resources depletion.SUMMARY0102.Life Cycle Assessment(LCA)is a modelling tool to assess environmental impacts related to a product during its entire lifespan to support sustainable development.Matter on earth is never destroyed or created,it is recycled within and between ecosystems through biogeochemical cycles.Task Select one of common item you use in your daily life(pencil,computer,mobile phone or etc.)and summarize what impacts it has on our environment through out its life cycle.References1.https:/