An official website of the United States government.

We've made some changes to EPA.gov. If the information you are looking for is not here, you may be able to find it on the EPA Web Archive or the January 19, 2017 Web Snapshot.

Documentation for the Waste Reduction Model (WARM)

Documentation for the Waste Reduction Model (WARM) includes user guides, detailed chapters on the development of the greenhouse gas (GHG) and energy factors used in WARM as well as several background supporting documents.

On this page:


Documentation for GHG Emission and Energy Factors Used in WARM

The WARM documentation explains the calculation of emission factors by material type, or group of materials, arranged into individual chapters. EPA also provides chapters addressing each specific materials management practice available in WARM, along with a background and overview chapter, a list of definitions and acronyms, user’s guides for the different versions of the WARM tool, a summary of recent updates in WARM and additional chapters on special topics like forest carbon sequestration and energy factors.

The WARM documentation chapters are grouped into several files based on the following chapter topics:

  • User's Guide WARM Version 14: provides an overview for users who may be new to the tool or need some basic knowledge about downloading and modeling scenarios in WARM version 14

  • User’s Guide WARM version 14 Excel: provides an overview for users of the Excel-based tool for WARM version 14. This guide is the same as the guide found on the first sheet of the WARM Excel tool

  • Background includes chapters covering:

    • WARM Background and Overview
    • Definitions and Acronyms
    • Recent Updates in WARM
    • Forest Carbon Storage
  • Management Practices includes chapters covering:

    • Source Reduction
    • Recycling
    • Anaerobic Digestion
    • Composting
    • Combustion
    • Landfilling
    • Energy Impacts
  • Containers, Packaging and Non-Durable Goods Materials includes chapters covering:

    • Glass
    • Metals
    • Paper Products
    • Plastics
    • Polylactide (PLA) Biopolymer
  • Organic Materials includes chapters covering:

    • Food Waste
    • Yard Trimmings
  • Durable Goods Materials includes chapters covering:

    • Personal Computers
    • Tires
  • Construction and Demolition Materials includes chapters covering:

    • Asphalt Concrete
    • Asphalt Shingles
    • Carpet
    • Clay Bricks
    • Concrete
    • Drywall
    • Fiberglass Insulation
    • Fly Ash
    • Vinyl Flooring
    • Wood Flooring
    • Wood Products

Top of Page


Additional Resources for WARM - User Guidance and Landfilling Factors

In addition to the WARM documentation chapters, EPA has compiled several documents that provide additional information on using WARM and the energy and emission factors applied in WARM. These additional documents are grouped by topic, including:

  • User Guidance on How to Use Materials and Management Pathways Not Found in WARM: provide information on how to use materials or management pathways not found in WARM, including guidance on using WARM emission factors for materials and pathways not in WARM, modeling food donation benefits, modeling increased product lifetime, modeling reuse, and the differences between WARM’s life-cycle greenhouse gas accounting approach and greenhouse gas emission inventories.

  • Landfilling and Landfill Carbon Storage: provide more detailed information on how landfilling and landfill carbon storage are modeled in WARM.

Top of Page