Im canada, there is still permafrost but not as far south as it used to be. Regions in Alaska are also experiencing a warming climate.
So much for the 'it's the urban heat island' myth.
You shouldn't lazyweb your homework. But Trevor has, well, the best explanation you're likely to get here, at least.
Permafrost is the name given to parts of the planet that are frozen for long periods of time (at least two years but in most cases it’s at 100,000+ years), these areas are vast – twice the size of the US. Sometimes during the warmer months the surface melts but the ground beneath remains frozen.
Global warming leads to climate change and with average global temperatures having increased then large areas of once frozen ground are now melting. Over a million square kilometres of Siberian permafrost has melted leaving behind a muddy landscape with thousands of new lakes.
The frozen ground is often peat, it has very little use when it melts as it supports only very specialised flora. When it does melt it releases vast reservoirs of methane gas that have accumulated beneath the ice and come from the decomposition of plant material. Methane is 25 times as effective as carbon dioxide when it comes to global warming. The melting of permafrost is therefore contributing to further climate change.
A building in Russia collapses as the ground beneath it melts:
Because it's melting.
Permafrost is not "permanent". The Earth has warmed and it has cooled....many times over many millions of years. This means that areas of "permafrost" ceased being so from time to time.
Really nothing new.
Because of climate change/global warming DUH
Oh and use the term,---> climate change to explain my question.
