Dive summary:

• New statistics from the EPA show that greenhouse gases from waste-related activities have fallen.
• While landfills are now releasing 30.3% less methane than in 1990, landfills are still number three on the EPA's worst offenders list.
• In 2011, landfills, composting and incineration produced about 122 million tons of carbon dioxide equivalents.

From the article:

But landfills still are the third-highest producer of anthropogenic methane in the country, trailing only natural gas recovery and the production of ruminant animals, including cows, according to the Environmental Industry Associations, a trade group representing private trash companies.

Landfills, composting and incineration produced about 122 million tons of carbon dioxide equivalents in 2011, EIA reported. ...