[smky80]

Methane's greenhouse gas effect is 20x that of CO2. [0]

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[0] http://epa.gov/climatechange/ghgemissions/gases/ch4.html

[ars]

The quantities we are talking about are pretty minimal though, and definitely worth the tradeoff with less coal (or oil for that matter).

[smky80]

I don't have a source handy, but I remember reading something to effect that when you figured in all the transportation costs for the fracking fluid and gas production, it really wasn't so clean.

[ars]

Can you look? I would like to read this source please.