We are screwed, reason #454

Remember the recent post about polar ice? Well, how about this:

The slow expansion of the tundra's snow-free season by about 2.5 days per decade since the 1960s explains 95 percent of the recent rise in [arctic] summer temperatures, and is far more influential than changes in vegetation, sea ice, atmospheric circulation or clouds, according to a report published this week in Science Express.

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