We’ve provided a link to a document produced by US EPA in 2006 on Solid Waste Management and Greenhouse Gases. Taken from the executive summary, “In the 21st century, management of municipal solid waste (MSW) continues to be an important environmental challenge facing the United States. In 2003, the United States generated 236.2 million tons1 of MSW, an increase of 15 percent over 1990 generation levels and 168 percent over 1980 levels.2 Climate change is also a serious issue, and the United States is embarking on a number of voluntary actions to reduce the emissions of greenhouse gases (GHGs) that can intensify climate change. By presenting material-specific GHG emission factors for various waste management options, this report examines the interrelationship between MSW management and climate change.
Among the efforts to slow the potential for climate change are measures to reduce emissions of carbon dioxide (CO2) from energy use, decrease emissions of methane (CH4) and other non-carbon-dioxide GHGs, and promote long-term storage of carbon in forests and soil. Management options for MSW provide many opportunities to affect these processes, directly or indirectly. This report integrates information on the GHG implications of various management options for some of the most common materials in MSW. To EPA’s knowledge, this work represents the most complete national study on GHG emissions and sinks from solid waste management practices. The report’s findings may be used to support a variety of programs and activities, including voluntary reporting of emission reductions from waste management practices.”

This is a technical resource with many useful charts and tables explaining contributions and offsets to Greenhouse Gases.