Credit: UNEP/GRID-Arendal
Trends in Arctic temperature, 1880-2006.
The chart shows that there have been colder periods in the Arctic and that the latest trend is warmer than the century average.
I think this illustrates pretty well the facts of the matter. What causes these variations in temperature and what consequences a lasting warming will have are still not well enough understood and we do our best to gather more information and understanding of the complex Earth system.
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