The largest known wildfire ever seen in Greenland (since 2000) was found by satellite.
The area (recently melted tundra) had undergone scrubification (shrubs were growing) in addition to lichels, mosses, of the tundra.
Apparently, the color of the smoke indicates peat (melted out from the permafrost) is burning.
It may have been human started.
Peat it seems is a carbon sink (I guess during the continuous process of its formation), but not when its burning.
Perhaps the flames will consume the heat trapping methane molecules to form the less bad CO2 that is expected to be released from melting permafrost, but the heat might locally speed melting. Now there's a benefit.