Our warming climate is melting the world’s ice, and in the Arctic, it’s right under people’s feet, as well as roads and bridges. The warming of the Arctic’s frozen ground is becoming a bigger problem for its residents. New research out this week from the journal “Nature Reviews Earth and Environment” found more than half of the infrastructure in the North will be threatened by 2050, requiring tens of billions of dollars in maintenance and repairs. The World’s host Carol Hills is joined by Paul Murchison, who is the executive director of major transportation programs for the Government of Yukon in northwestern Canada.