The Maple Leafs strengthened their blue line by adding Colorado's Ryan O'Byrne for a fourth-round pick in the 2014 draft.

WSJ: Busy Blue Jackets add Gaborik to nudge playoff run

Many U.S. cities began adding fluoride to water in the 1950s after evidence showed it strengthened teeth, but Portland always held out.

WSJ: Fight Over Fluoridated Water Splits Portland's Left

But even if the ice melts as fast as shippers hope (and scientists fear), navigation is likely to demand strengthened hulls, higher insurance and extra training for crews, all adding to the costs.

ECONOMIST: A meltdown tinged with acid