Argument: The Arctic has not consistently warmed in the way that human-caused global warming theory would have it
- John Christy, a climate expert - "If you look at the long term records, the Arctic has been as warm or warmer than it is today," says Christy. He cites temperature data from the Hadley Centre in the UK showing that from 70 degrees north latitude to the pole, the warmest years on record in the Arctic were 1937 and 1938. This area is just slightly above the Arctic Circle.
- Furthermore, those same records show that the Arctic warmed twice as fast between 1917 and 1937 as it has in the past 20 years. After 1940, the Arctic saw a big cool-down and climatologists noted sea ice expanding in the northern Atlantic. Christy argues that what he calls the Great Climate Shift occurred in the late 1970s and caused another sudden warming in the Arctic. Since the late 1970s there has not been much additional warming in the region at all. In fact, on page 23, the Arctic Council Assessment offers very similar data for Arctic temperature trends from 60 degrees north latitude—the area that includes most of Alaska and essentially all of Greenland, most of Norway and Sweden, and the bulk of Russia.