Albedo is an obvious possibility but I would guess another (at least), more rapid, positive feedback process is involved. I know I am speculating now but several possibilities occur to me: thermohaline circulation changes; permafrost thawing; CO2 cycle changes.

Another thought occurs to me: the dramatic large temperature increases may indicate that increased atmospheric cloud due to warming may be less of a negative feedback (albedo) than expected.

Thanks for the link, it will have to wait till tomorrow but I will definitely read it and say what I think here.

Check your hotmail.
Did and replied, must sleep now, back tomorrow, the Force permitting, haha