Reassessment of methane’s greenhouse gas warming potential (GWP): GWP over 100-year = 33, GWP over 20-year = 105
Drew T. Shindell
Improved Attribution of Climate Forcing to Emissions
Science, Oct. 2009
See also:
http://www.see.ed.ac.uk/~shs/Climate%20change/Data%20sources/Shindell%20methane.pdf





