As Arctic sea ice retreats, the startup Real Ice is testing a bold idea in Nunavut, Canada: pump seawater onto the ice so it refreezes, layer by layer. From December to February, the team hauls pumps out each morning and back each night before they freeze in. After weeks of flooding, the ice reaches up to 130 cm, and Inuit guide Pamela Nakashook says she has hope it could solve a lot of problems.