Random new climate change fact re climate sensitivity

Didn't know this factoid before, from RealClimate:

The climate sensitivity classically defined is the response of global mean temperature to a forcing once all the 'fast feedbacks' have occurred (atmospheric temperatures, clouds, water vapour, winds, snow, sea ice etc.), but before any of the 'slow' feedbacks have kicked in (ice sheets, vegetation, carbon cycle etc.).

I would guess that the slow feedbacks, at least the ones that are faster than tectonic plate movements, seem likely to be bad news rather than good news, so the classic sensitivity definition is an understatement. And there's Hansen's concern that the ice sheet feedbacks may not be so slow.