Greenland is on fire. We are in a lot of trouble, folks.
Jason Box, renowned climate scientist, is reviewing the 270 scientific publications on Arctic land ice from the past 5 years. Per Mr Box: “The effort is to be published by the Arctic Monitoring and Assessment Program (AMAP). If you've read this far, you're gonna want to read the following and you're going to want to brace yourself...”
"Increased glacial surface melt water infiltration induces ice internal warming. Warmer ice deforms more easily, promoting a dynamical flow response to clima...te warming and increasing irreversible feedbacks from surface elevation drawdown into warmer parts of the atmosphere. The increase in melt area and volume with warming is non-linear because ice cap or ice sheet elevation profiles are flatter as elevation increases. In a warming scenario, a melt-elevation feedback threatens to produce irreversible ice cap and ice sheet loss. Irreversibility depends on sufficient ice surface elevation drawdown and warming sustained above some stable threshold. The larger the land ice body, the longer time needed for the irreversibility threshold to be crossed.
"The Greenland ice sheet is essentially lost in a climate as warm or warmer than that during 2000-2015. Yet, the loss rate depends strongly on amount of warming above a stable level. In the case of Greenland, summer warming above pre-industrial is 1.2-1.6 C. If warming were stabilized at 1 C above the preindustrial era, the loss of a significant fraction of the Greenland ice sheet appears to require 10s of thousands of years. Larger and expected warming (3-6 C above preindustrial summer temperatures by year 2100) reduces the time of significant ice sheet loss from millennia to centuries.
I would add, between you and me... Thus the rational response is to recommend policies that keep climate warming below 1 C above preindustrial temperatures. The Paris Accord produced ambitions to keep warming below +1.5 C annual temperature above pre-industrial. Yet what countries brought to the table would produce +3 C warming, perhaps more. To meet the Paris Accord ambitions, emissions must be reduced approaching 10% per year. That's fast.