The summer water temperatures, reconstructed from the makeup of tiny organisms buried in sediments in the Fram strait, have risen from an average 5.2 degrees Celsius (41.36F) from 1890-2007 and about 3.4C (38.12F) in the previous 1,900 years.
tiny organisms buried in sediment?
All I needed to read.
Maybe they can tell how hot it was in Chicago last summer buy how much snow falls in New York City in January.
Notice how all these studies stop at 2007, which was the lowest ice level. Of course in the last 4 years the ice has been recovering so their results won't have as scary numbers. Chopping off cooling years at the end was the "Hide the Decline" trick
I would also bet their other years are similarly cherrypicked. The Arctic was very warm during the 1930's, so I'd bet their numbers wouldn't have been as scary if they started there.