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I wonder what is the quantity of CO2 that is released annually by this crater. Must be tremendous.

I'm under the impression that whatever ways to pollute less we come up with, it will be annihilated by things like this or just sheer overpopulation.

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It's probably not that much, on a global scale. What's more, CO2 is a better gas to be venting to the atmosphere than methane is. [citation needed]

Indeed, methane is at least an order of magnitude greenhouse gas as C02 : " over a 100-year period, it traps 29 times more heat per mass unit than carbon dioxide".[0]

[0] http://en.wikipedia.org/wiki/Atmospheric_methane

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