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14 Cards in this Set

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  • Back

US Energy use (total and sector level, renewable share)

About 100 quads total, 40% on buildings, 30% in industry, and 30% in transport. 10% renewables

CO2e intensity of energy sources


Rank freight transportation modes for GHGs


Name 3 stages of LCA

1. Goal definition and scope

2. Life cycle inventory assessment

3. Impact Assessment

Efficiency of US grid



Defines the purpose and method of the LCA, including audience, application and objectives.


Define function and functional unit

Define system boundaries

System Boundary

Which unit processes and which parts of the life cycle should be included in the study.

Life Cycle Inventory

The quantification of relevant inputs and outputs for a given system throughout its lifecycle.

Steps in a Life Cycle Inventory

1. Detailed flow diagram

2. Data collection plan

3. Collect data

4. Model system and report inventory

System Expansion

Displacement: LCA subtracts alternative process from main process

Life Cycle Impact Assessment (LCIA)

Translate the inventory to meaningful indicators of a product or system's impact on the environment and human health.

LCIA Components

1. Classification: assign inventory results to impact categories.

2. Characterization: model inventory results to an indicator for each category (e.g. equivalency assessment)

3. Valuation (optional)

Endpoint vs midpoint impact

Endpoint: evaluate the damage caused by a pollutant or resource depletion.

Midpoint: indicator based on steps in the impact chain prior to endpoint