[Methane is 10 times more efficent as a greenhouse gas as compared to CO2.]

"In The New Republic Gregg Easterbrook describes (subscription required) the Bush Administration’s “Methane to Markets” partnership (EPA site). Easterbrook argues that the Bush Administration has not gotten enough credit in the media for this program, which he characterizes as being as significant as successful implementation of the Kyoto Protocol.
...
Easterbrook refers to NASA’s ubiquitous James Hansen to support the importance of methane policy. Hansen wrote five years ago, “Non-CO2 greenhouse gases are probably the main cause of observed global warming, with CH4 causing the largest net climate forcing. There are economic incentives to reduce or capture CH4 emissions, but global implementation of appropriate practices requires international cooperation.” (The full peer-reviewed paper can be found here – PDF.)"
http://sciencepolicy.colorado.edu/prometheus/archives/climate_change/000350methane_policy.html