1. Why did explorers seek the Northwest Passage?

2. And the Northwest Passage in the Arctic became ice-free for the first time in living memory.

3. The Northwest Passage and the Northern Sea Routeacross the top of Russiahave indeed been made navigable by climate change, but only for a few days orweeks a year.

4. The ever elusive Northwest Passage may be revealing itself in the Arctic.

5. Last August, the Northwest Passage was open to navigation for the first time memory.

6. Last August, the Northwest Passage was open to navigation for the first time in memory.

7. Scientists saying the Northwest Passage could open up to year-round shipping by 2050.

8. Bowhead whales, the giants of the Arctic, are using the Northwest Passage to move across the top of the Americas.

9. Other explorers to the Arctic Ocean have sought the fabled Northwest Passage direct shipping route from Europe to Asia across the polar ice.

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10. "The probability of ship-strike mortalities may increase with thelikely future opening of an ice-free Northwest Passage, " theresearchers note.

11. Canada and the United States are at odds over the sovereignty of the Northwest Passage that links the Atlantic to the Pacific oceans.

12. On May 19, 1845, two ships set out from England in search of the Northwest Passage through the Arctic.

13. Breadalbane, a British ship that went down in the 1850s while on a mission to find survivors of the ill-fated Franklin expedition to map the Northwest Passage.

14. Since reading about it as a boy, Amundsen had been fascinated by Englishman John Franklin's disastrous search for the Northwest Passage.

15. Davys, also Davis:English navigator who explored the arctic while searching for the Northwest Passage and later sailed to the South Seas. He discovered the Falkland Islands in 1592.

16. Beattie's gruesome raising of Franklin's dead, had answered the age-old question of what happened to the ill-fated Northwest Passage expedition.

17. Warming's most obvious oceanic effect is the opening of the fabled Northwest passage for the first time in recorded history.

18. And there are squabbles over new shortcuts for shipping around the Siberian coast and Northwest Passage.

19. Torrington had been chief Stoker aboard the Erebus which along with the Terror sailed with Sir John Franklin during his expedition to chart the Northwest Passage.

20. And there are squabbles over new shortcuts for shipping around the Siberian coast and the Northwest Passage.

21. The Arctic ice cap shrank so much this summer that waves briefly lapped along two long-imagined Arctic shipping routes, the Northwest Passage over Canada and the Northern Sea Route over Russia.