president barack obama<u+2019>s trip to alaska<u+2019>s arctic on monday likely will reverberate much farther south, on the 2016 presidential campaign trail, where global warming is expected to emerge as a key issue.









his visit to the north pole region, the first ever for a sitting president, coincides with a growing public consensus that the earth is heating up and that humans have something to do with it.
obama<u+2019>s arctic trip comes as climate change builds as 2016 issue
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