Fw: WARM Version 13 Released with New Emission Factors for Food Waste and Updated Methodology for Landfilling and Composting

[Gary Liss]

Apologies for Cross-postings.

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From: "Kollar, Tiffany" <Kollar....@epa.gov>

Date: Wed, 6 Aug 2014 14:03:24 +0000

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Cc: Elina Bouloubasis<Elina.Bo...@erg.com>; Grist, Terry<Grist...@epa.gov>

Subject: WARM Version 13 Released with New Emission Factors for Food Waste and Updated Methodology for Landfilling and Composting

WARM Version 13 Released with New Emission Factors for Food Waste and Updated Methodology for Landfilling and Composting WARM v13: EPA has released WARM Version 13, the latest version of EPA’s Waste Reduction Model, at http://www.epa.gov/warm. WARM is designed to compare the life-cycle greenhouse gas (GHG) and energy implications of alternative materials management options for common municipal solid waste materials. By comparing a baseline scenario to an alternative scenario (e.g., recycling), WARM can assess the energy and GHG emissions implications of materials management from a life-cycle perspective. Updated Materials and Methodologies: This new version of WARM incorporates several updates to reflect the development of recent life-cycle inventory data. The following material management pathways have undergone significant revisions: Landfilling -- Updates include revised material properties and decay rates, expanded landfill management scenarios, and a more detailed approach to addressing landfill gas efficiency and methane oxidation. Composting -- Emission factors now account for fugitive emissions of CH4 and N2O during the composting process based on recent, peer-reviewed scientific literature. Food Waste has been updated to include source reduction as a management pathway with new food waste categories: Food Waste (Non-Meat) A weighted average of the four food waste materials below Grains (MS Excel version only) Bread (MS Excel version only) Dairy Products (MS Excel version only) Fruits and Vegetables (MS Excel version only)   The following mixed emission factors have undergone revisions to reflect changes in composition: Mixed Metals Mixed Plastics Mixed Recyclables   Annual Updates: GWPs for gases have been updated to IPCC Fourth Assessment Report (AR4) values. There have also been routine updates of underlying data, including changes to electricity grid assumptions, landfill gas recovery assumptions, retail transport emissions, and MSW generation and recovery values. GHG equivalencies have been updated to match those provided by the EPA’s GHG Equivalency Calculator. New Documentation: Updated documentation covering the data and methodology behind WARM v13 is also available. This documentation is organized by material type and is an update of the 2006 report Greenhouse Gas Emissions from Management of Selected Materials in Municipal Solid Waste. It is available for download at http://www.epa.gov/climatechange/wycd/waste/SWMGHGreport.html.