The Arctic is one of global parts that is warming up fastest today. Measurements of air temperature show that the most recent five-year period has been the warmest since 1880, when monitoring began.
Other data, from tree rings among other things, show that the summer temperatures over the last decades have been the highest in 2000 years. As a consequence, the snow cover in May and June has decreased by close to 20 percent.
The winter season has also become almost two weeks shorter - in just a few decades.
Besides, the temperature in the permafrost has increased by between half a degree and two degrees.
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