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Dictionary

LCAs

The study of a product's environmental impacts from 'cradle to grave' is formally known as Life Cycle Assessment. It is used to compare products, such as in the choice between plastic or paper cups.

  • Cradle-to-Cradle

    • Closed loop LCA, which extends the standard LCA (cradle-to-grave) to recycling or reuse.

  • Cradle-to-Gate

    • Partial LCA (Life Cycle Assessment), describing all factors from resource extraction to factory gate.

  • Cradle to Grave

    • [Life Cycle Assessment] Refers to the procedure for analysing every stage of a product's life, from the extraction of raw materials, through manufacture, transport, use, to disposal.

  • Goal and Scope

    • Goal and Scope Definition is the first stage of a project, e.g. LCA.

      This phase involves screening of projects, to ensure the LCA is necessary and beneficial to the parties. Projects cannot be open-ended, so goals must be defined. These can have significant consequences for the type of data that is collected, and how it is interpreted and weighted. The scope is an agreed limit to the physical and temporal boundaries of the system(s) being studied.

      An LCA study must state clearly what the overall purpose is, what decisions may be made on its findings, and whether the results are for public or internal consumption.

      Scoping identifies the function, system, system boundaries, functional unit, data requirements, alternatives for products or services, key assumptions, anticipated limitations, geographical and time limits.

      A functional unit is defined, so that unlike products and services may be compared across the board.

      The system boundaries are defined in a fair way, so that the project does not grow beyond the resources provided. It may be acceptable to create groups of types of supply industries and disposal mechanisms.

  • Grey energy

    • The energy necessary for the production, transport, storage, sale and disposal of a product.

      For example, an imported good has an energy price tag which is higher than a locally-produced identical product. An LCA needs to take into account the grey energy in its determination of environmental footprints in the life cycle of a product.

  • Global Warming Potential

    • Global Warming Potential

      A measure of the potential of a substance, product or process to cause changes to the atmospheric gases, which will lead to global warming. Often synonymous with emissions of CO2, although other gases, such as methane, are also significant.

  • Life Cycle Data System

    • International Reference Life Cycle Data System. The LCIA Handbook provides a series of technical guidance documents for LCA. There are 14 impact categories with recommended models and indicators.

  • Interpretation

    • The final stage of a project, such as an LCA Life Cycle Assessment. It lists and discusses the results in terms of the most important parameters (consistency, completeness and sensitivity analysis), along with conclusions and recommendations.

      p>Now that the goals have been defined, an inventory of material and energy flows, and their impacts, calculated and allocated to environmental impact categories, an assessment is possible. The primary parameters for the results are identified, and the uncertainties quantified. The indicators, such as the Swiss eco-points (EP) system, can be used for a comparison of the different products or processes.

      Recommendations concerning the set goals can be derived, to achieve the targets of the maintenance of air quality, ground and water protection, or global warming potential reduction.

      Information on the SimaPro software

      Information on the Gabi software

  • Life Cycle Inventory

    • [LCA] Also Inventory Analysis, the Life Cycle Inventory (LCI) is the second stage of an LCA, Life Cycle Assessment, in accordance with ISO 14044.

      The LCI provides quantified information concerning the product life cycle, including resource use (inputs and outputs), use (functional unit), and the related emissions, but without any attempt at evaluation at this stage.

      Environmental Science
      LCA Life Cycle Assessment analyses the environmental impacts of products from the cradle to the grave

      Which environmental impacts exist in the production, use and disposal of the product? The inventory makes quantitative statements concerning the major stages of the entire life cycle path, concerning the consumption of raw materials and energy, and emissions of pollution. There are a large number of software systems and databanks to aid in this task.

      The Inventory involves the collection of data about all inputs and outputs of a system, and requires decisions concerning allocation. In the inventory procedure, there are a number of software processes, which contain algorithms for the calculation of cumulated inventory results, as well as reference databanks.