Arctic Report Card 2011
http://www.arctic.noaa.gov/reportcard/
Concludes that 6 years of observations indicate a shift in the Arctic Ocean system since 2006 characterized by persistent decline in the thickness and summer extent of the sea ice cover and a warmer upper ocean. Biological productivity at the base of the marine food chain has increased but sea-ice dependent marine mammals continue to lose habitat. From the National Oceanic and Atmospheric Administration
