Canadian Politics Today

I was not talking about the basic GHG effect. The claim that the earth is an unstable system subject to 'tipping points' due to GHGs is nothing but a hypothesis.

in regards the discussion of 'thawing permafrost' (relative to that fifth of the Northern Hemisphere landmass that is permafrost), my emphasis was on your oft repeated references to, "an inability to repeat experimentally". The study I linked to is, I interpret, the first to laboratory control measure/quantify the long-term production of methane in thawing permafrost... particularly the emphasis on methane production in water-saturated (absent oxygen) permafrost versus dry-soil permafrost... an addition to and reinforcement of the warming feedback due to melting ice uncovering and destabilizing tundra permafrost.

this measurable data will enable more accurate projections about the impacts of thawing permafrost... perhaps leading towards an eventual inclusion of feedbacks from thawing permafrost in IPCC projections; now absent from current models/modeling.