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http://www.jpl.nasa.gov/news/news.php?release=2012-263
I am not sure the theory on fracking increasing atmospheric methane is true, especially if it replaces coal. Coal mining has released methane in the past, and trapping and using the methane is probably partly responsible for dropping atmospheric concentrations:
http://en.wikipedia.org/wiki/Coalbed_methane
When you think about removal capacity, it's not clear how much methane concentrations will increase from fracking, esp. since in some cases methane will be exploited.
http://www.eci.ox.ac.uk/research/energy/downloads/methaneuk/chapter02.pdf
Now mining the methane hydrate ice under the seas may be a totally different thing.
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