You're so fucking dumb it is palpable. It is not the sort of claim which can be or requires citation. Companies and nations plan their travels and shipping and the lane is open. They don't have to ask scientists if it ok.
I call BS, you said "2009 was the first year ever that the northwest passage remained navigable year round."
You found this cockamamy claim somewhere or you wouldn't have made the claim.
I've searched my ass off and can't find one story about the Northwest Passage be open all year round.
I've heard predictions about it, but we all know what happens when global warming alarmists make prediction.
If you can't back up your claim, just admit it.
You call me dumb for something you said, that can't be substantiated. LOL