Past Climate Variability and Change in the Arctic and at High Latitudes

Over the past 30 years, average temperatures in the Arctic have increased at almost twice the rate of the planet as a whole. Such temperature changes have been accompanied by shrinking sea ice, melting ice and permafrost on land, and widespread impacts to land and ocean ecosystems.

Temperature Trends in the Lower Atmosphere: Steps for Understanding and Reconciling Differences

This report addresses previously identified discrepancies between observations and simulations of surface and atmospheric temperature trends.  It is an important revision to the conclusions of earlier reports from the U.S. National Research Council and the IPCC.