Release of all the stored methane would not cause the Earth to turn into Venus. We know this because the process has happened several times, and not only did th

Release of all the stored methane would not cause the Earth to turn into Venus. We know this because the process has happened several times, and not only did the Earth not become Venus, it did not come anywhere even remotely close. There is no known process by which climate change would render the Earth uninhabitable. This doesn't mean it's okay. Release of methane has always happened at the same time as major mass extinctions, possibly as the cause of it. It would create massive warming which would make large inhabited parts of the planet much less desirable, play havoc with the biosphere possibly making large areas of farmland unproductive, and in general being a massive economic drain and probably killing a lot of people.