After 300 years of fruitless (and sometimes deadly) attempts to find the fabled Northwest Passage, a sea route to connect the Atlantic and Pacific oceans via the Arctic, global warming’s shown up all those hard-man sailors by suddenly making the journey easy. In 2007, higher temperatures had melted enough of that pesky Arctic ice to open the passage up to non-icebreaking vessels for the very first time, and since then the ice has only continued to melt — meaning more and more shippers will be using this efficient trade route.
But what’s good news for shippers is not necessarily good news for the rest of us: More vessels taking the northern course is also projected to spread harmful invasive species.
“What’s happening now is that ships move between oceans by going through the Panama or Suez [canals], but that means ships from higher latitudes have to divert south into…
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