Methane is a significant global warming gas because of its
global warming potential which is 21 times stronger than
that of CO2 (US EPA, 2006). Landfills are one of the largest
anthropogenic sources of CH4 emissions (US EPA, 2006).
Methane emission control is of utmost importance for global
warming reduction. Methane can be degraded by methanotrophic
bacteria, which can grow using CH4 as a sole
carbon source in aerated soil and thus soil can serve as an
important biological sink of atmospheric CH4 (Adamsen
and King, 1993). Methane oxidation in conventional landfill