The days of the ice roads may be few. Canada has more than 3,300 miles of them, all necessary for keeping North America’s farthest-flung inhabitants supplied through a long and brutal year. But The New York Times reports that the fractal network of paths are freezing later and thawing earlier than ever before. Canadian authorities point to climate change as the culprit and have begun preparing for a time when the ice can no longer support human travel. It means construction of new and expensive all-season roads. It means the chances to ride the ice grow slim.