There are a slew of articles dealing with a study revealing a big increase in shipping & shipping routes by 2050. The impact for Canada, as noted in the National Post, is the Parry Channel becoming the main shipping lane. The co-author had written in a 200 book that Canada would be a major world power thanks to climate change; his latest study might bolster that point.
Some of the barriers to travelling through is the Arctic are the extra costs in ice-strengthening ships, free ice floating on the water & more storms along the Arctic coasts. Not to mention that Canada will spend 280 million US$ on the design of new Arctic offshore patrol ships.