The US Environmental Protection Agency (EPA) has announced the release of an updated version or their Waste Reduction Model or WARM. This model allows decision makers to compare life-cycle greenhouse gas (GHG) and energy implications for various materials management options or common municipal solid waste materials. This new version incorporates several changes to reflect recent developments in life-cycle inventory data. Based upon EPA’s email announcing the release the landfilling and composting pathways have undergone significant revisions. The model can be found online at: http:www.epa.gov/warm.