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Originally Posted by Tog_
My layman's guess would be that mot something like could really do would be about like a small underground nuke test, and that's assuming that the Nat Gas was low enough pressure to actually ignite. For an oil well, I can't imagine an explosion so much as a steady burn. So still no ka-boom.
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Not sure what that first phrase is, but... I agree with you. Without oxygen, it ain't gonna happen. Even that PA coal fire is absorbing the oxygen very slowly through the ground. But only fast enough to keep it smoldering.
As far as the heating of the earth... The worst effect would be that it would just melt. Lots of changes, destruction and uncomfortableness(?), but no global "event".