February 25, 2013. A watershed moment in most regions of the planet will melting Permafrost, can occur even when the temperature rises of 1.5 degrees compared with the end of the 19th century. This is evidenced by the results of the study of stalactites and stalagmites in caves along the "border Permafrost"Siberia.
According to the study of the international group of scientists from the UK, Russia, Mongolia and Switzerland, led by Anton Vaxom of Oxford University, published in the journal Science, about 400 million years ago there was a particularly warm period (Marine Isotopic Stage 11).
Then temperature was only 1.5 degrees Celsius above pre-industrial levels. This was enough to cause a significant melting Permafrost.
Eternal frigidity covers 24% of the land surface of the northern hemisphere, so its significant melting in Siberia, Scandinavia, the southern tip of Greenland, Canada, and southern Alaska will lead to getting into the atmosphere a few gigatons of carbon, which would cause an additional increase in temperature on Earth.
Furthermore, due to melting Permafrost will be extremely vulnerable objects in natural gas, power lines, roads, railways and buildings built on permafrost.
At the same time, many scientists believe exaggerated fears that the release of stored in permafrost, greenhouse gas emissions will lead to a major escalation of global warming. They are motivated by the fact that the process is extremely slow.