Another alarmist fantasy kicks the bucket.
Arctic alarmists claim that Amundsen took three years to navigate the Northwest Passage because there was too much ice. It turns out that (like almost everything else alarmists say) is incorrect.
Amundsen said the Passage was open in 1903, but he chose to stay and do research.
Real Science 
A quick survey of the records a few years ago showed that the northern waters were open 75 out of the last 112 years.
Do you have a list of the years when the NW Passage was open?