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Overview of the Lifecycle Emissions Model (LEM)


Research Report

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Suggested Citation:
Delucchi, Mark A. (2002) Overview of the Lifecycle Emissions Model (LEM). Institute of Transportation Studies, University of California, Davis, Research Report UCD-ITS-RR-02-02

The task of developing and evaluating strategies to reduce emissions of urban air pollutants and greenhouse gases is complicated. There are many ways to produce and use energy, many sources of emissions in an energy lifecycle, and several kinds of pollutants (or greenhouse gases) emitted at each source. An evaluation of strategies to reduce emissions of greenhouse gases must be broad, detailed, and systematic. It must encompass the full "lifecycle" of a particular technology or policy, and include all of the relevant pollutants and their effects. Towards this end, I have developed a detailed, comprehensive model of lifecycle emissions of urban air pollutants and greenhouse gases from the use of variety of transportation modes.

The Lifecycle Emissions Model (LEM) estimates energy use, criteria pollutant emissions, and CO2-equivalent greenhouse-gas emissions from a variety of transportation and energy lifecycles. It includes a wide range of modes of passenger and freight transport, electricity generation, heating and cooking, and more. For transport modes, it represents the lifecycle of fuels, vehicles, materials, and infrastructure. It energy use and all regulated air pollutants plus so-called greenhouse gases. It includes input data for up to 20 countries, for the years 1970 to 2050, and is fully specified for the U. S. The remainder of this paper provides a further overview of the LEM.