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It's not the actual possibility of disaster which bothers me, it's the inability of mankind to address the issue as it is, and save ourselves from possible extinction or at least a highly dystopian future.
The clathrate gun hypothesis is the popular name given to the hypothesis that rises in sea temperatures (and/or falls in sea level) can trigger the sudden release of methane from methane clathrate compounds buried in seabeds and permafrost which, because the methane itself is a powerful greenhouse gas, leads to further temperature rise and further methane clathrate destabilization – in effect initiating a runaway process as irreversible, once started, as the firing of a gun. Source
James P. Kennett, Kevin G. Cannariato, Ingrid L. Hendy, and Richard J. Behl, (2003) Methane Hydrates in Quaternary Climate Change: The Clathrate Gun Hypothesis, Washington, DC: American Geophysical Union. ISBN 0875902960
The Clathrate Gun metaphor refers to the sequential and repeated steps of loading the methane hydrate reservoir, triggering hydrate dissociation by changes in intermediate-water temperature, and energetically discharging CH4 into the ocean/atmosphere to amplify late Quaternary climate warming events that were strongly reinforced by other greenhouse gases, especially water vapor. Methane hydrates in Quaternary climate change: the clathrate gun hypothesis, by James P. Kennett