Arctic temperatures are warmest in 2,000 years.

From LiveScience:

Arctic air temperatures in the 1990s were the warmest in the last 2,000 years and were a result of rising greenhouse gas levels, a new study concludes.

The findings, detailed in the Sept. 4 issue of the journal Science, also suggest that if it weren’t for these manmade pollutants, temperatures around the North Pole would actually be cooling as a result of natural climate patterns.

"This result is particularly important because the Arctic, perhaps more than any other region on Earth, is facing dramatic impacts from climate change," said study team member David Schneider of the National Center for Atmospheric Research (NCAR). "This study provides us with a long-term record that reveals how greenhouse gases from human activities are overwhelming the Arctic's natural climate system."