Passing the treaty would also give the U.S. the tools to claim an area of the Beaufort Sea that Canada considers its own.
Canada insists the international border continues through the ocean in a straight line from the land along the border between Alaska and the Yukon.
The U.S. argues the border angles 30 degrees to the east, an area with high energy potential.
Global warming is reducing ice cover in the Arctic, suggesting shipping routes could open up within a decade, providing new impetus for countries like the United States, Canada, Denmark, Norway and Russia to jockey for claims.
While the treaty is supported by many U.S. groups, some conservatives don't like the idea of international law dictating American interests.
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