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Life Cycle Assessment is a repeated process
Goal and scope
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Definition of the objectives of the study
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Choice of the functional unit
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Delimitation of the system boundaries
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Data quality requirements
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Cut-off rules
Life Cycle Inventory Analysis
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The system : construction of the life cycle tree
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Data collection
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Use of data
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Application of cut-off rules, taking into account of co-products
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Computation of the inventory
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Identification of the contribution of flows to the different
life cycle stages, and identification of the most represented
stages
Impacts assessment
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Selection of impacts categories
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Determination of the flows that are taken into account for
the impact assessment
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Determination of their contribution to the impacts
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Computation of the impacts
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Identification of the main flows contributing to the impacts
Interpretation of results
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Identification of the strong and the weak points of the studied
cases
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Meeting the goals set during the first stage
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Validation of the solution if necessary by the way of :
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additional data collection
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sensitivity analysis, scenarios
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Detail of the applications and boundaries of the study
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Leading to other possible studies
Example of system description
Example of inventory
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System: Car Life Cycle
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Inventory: new inventory.4
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English (UK)
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3,1
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Sep: .
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Flow
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Units
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Car Life Cycle
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1. Production
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2. Utilisation
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3. End of Life
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(r) Bauxite (Al2O3, ore)
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kg
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1,69524
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0,0509883
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1,64825
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-0,004
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(r) Clay (in ground)
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kg
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0,682547
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0,00452018
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0,678027
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0
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(r) Coal (in ground)
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kg
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727,459
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1019,67
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121,469
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-413,677
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(r) Iron (Fe, ore)
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kg
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3,81E+02
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7,61E+02
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3,17E+00
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-383,273
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(r) Natural Gas (in ground)
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kg
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1266,35
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201,158
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1077,56
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-12,3682
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(r) Oil (in ground)
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kg
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12840,4
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309,212
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12572,4
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-41,1687
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(r) Uranium (U, ore)
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kg
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0,0450994
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0,0374376
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0,00833323
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-0,00067142
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Water Used (total)
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litre
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78526,9
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24623,2
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56387,9
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-2484,16
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Water: Unspecified Origin
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litre
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78526,9
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24623,2
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56387,9
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-2484,16
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(a) Carbon Dioxide (CO2, fossil)
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g
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4,43E+07
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3,06E+06
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4,20E+07
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-764017
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(a) Carbon Monoxide (CO)
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g
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616373
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19556,6
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602497
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-5680,72
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(a) Nitrogen Oxides (NOx as NO2)
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g
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109260
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8113,87
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102280
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-1134,29
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(a) Sulphur Oxides (SOx as SO2)
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g
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56131,1
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9864,44
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48065,8
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-1799,16
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(w) Ammonia (NH4+, NH3, as N)
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g
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1079,04
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12,0609
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1068,07
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-1,0949
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(w) BOD5 (Biochemical Oxygen Demand
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g
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221,143
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196,206
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30,9368
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-6
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(w) COD (Chemical Oxygen Demand)
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g
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2855,31
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1044,52
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1878
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-67,2101
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Waste (hazardous)
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kg
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15,692
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0,819629
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14,9443
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-0,072
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Waste (total)
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kg
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182,678
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80,0142
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128,131
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-25,4669
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Waste: Mineral (inert)
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kg
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167
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71,542
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60,2971
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-24,6649
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E Non Renewable Energy
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MJ
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597499
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49427
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557890
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-9818,12
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E Renewable Energy
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MJ
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1428,44
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857,692
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669,008
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-98,2633
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E Total Primary Energy
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MJ
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598968
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50285
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558599
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-9916,38
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Electricity
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MJ elec
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12000,2
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5008,07
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3952,9
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3039,18
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Environmental impacts assessment
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