Methane Rising

http://www.independent.co.uk/environment/climate-change/methane-levels-may-see-runaway-rise-scientists-warn-1906484.html

Behind Paywall :-
http://www.newscientist.com/article/mg20127011.500-arctic-meltdown-is-a-threat-to-humanity.html?full=true

Select “CH4” for Methane :-
http://www.esrl.noaa.gov/gmd/ccgg/iadv/

http://cdiac.ornl.gov/ndps/alegage.html

http://agage.eas.gatech.edu/data.htm

http://agage.eas.gatech.edu/images/Data_figures/gcmd_month/ch4_monS5.pdf