 Methane is the second most important anthropogenic greenhouse gas after CO2 and is responsible for approximately 40% of global warming over the past 150 years.Further, for the past 25 years, global anthropogenic methane emissions have exceeded those from natural sources.Emissions from landfill sites account for 30% of the total anthropogenic methane emissions in Europe, 34% of those in the US, and 10% of anthropogenic methane emissions worldwide.