Why Is the Thawing of Permafrost in the Arctic of Special

Why is the thawing of permafrost in the Arctic of special concern?

A) Thawing permafrost will lead to increased solifluction.
B) Most permafrost is in the Southern Hemisphere where the thawing is contributing to a decline in global biodiversity.
C) Wet peatland forests will be further drained and logged as the conditions are conducive for such activity.
D) Permafrost thawing releases massive amounts of methane into the atmosphere,which could further amplify warming.
E) As permafrost thaws,it will contribute to global sea level rise.