Debris from the Titan was returned to land off Newfoundland, nearly a week after an international search-and-rescue effort for the vessel ended and its five passengers were presumed dead.
In a new study, scientists found that the climate milestone could come about a decade sooner than anticipated, even if planet-warming emissions are gradually reduced.
Russia may be having major difficulties in Ukraine, but it remains a vast power in the north and the Arctic, where climate change is opening new sea routes for trade and trouble.