Here's a tip for anyone trying to figure out when and whether global warming might arrive and what changes it will bring: hop a plane to the Arctic and look down. You'll see that climatic changes are already reworking the far-north landscape. In the past two decades, average annual temperatures have climbed as much as 7[degrees]F in Alaska, Siberia and parts of Canada. Sea ice is 40% thinner and covers 6% less area than in 1980. Permafrost--permanently frozen subsoil--is proving less permanent. And even polar tourists are returning with less than chilling tales, one of which was heard around the world...
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