As it gets warmer the amount of Tundra will become larger.
Canada's Tundra stores more then half of the World's methane the singular worst of the global warning gasses. Add to this the millions upon millions of tonnes of Carbon Dioxide that is frozen into that same Tundra.
If we do not arrest global warning it will be the end of civilization as we know it. And, its not going to take centuries to accomplish this dubious end! A few years should put us around the corner!
The significance of what is happening will effect the world at large and cannot be understated.