[regularfry]

That doesn't mean that the climate will return to where it was before the release. It could find a new stable point at a higher temperature than it is now due to changes in the Earth's albedo, among other things.

Also, "disappeared": what it ends up breaking down into is carbon dioxide and water vapour, both greenhouse gases in their own right.

[pja]

But at least they're much less powerful greenhouse gases than methane itself (IIRC).