Dark Red plant has dark red leaves which allow it to absorb more heat from the sun.
Cotton grass also grows because it seeds get carried with the wind and are planted.
But they do not grow for a long time , but they carry out photosynthesis with low temperatures and short periods of daylight
Also, footprints and tire tracks can turn into ruts. When sunlight hits the ruts, they melts the permafrost causing erosion. When the ruts get big, they turn into gullies.
Also, global warming is melting the tundra at a very fast rate. If this does not stop, it will melt completely, leaving no where for the animals that already live there to go.