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A controversial plan to refreeze the Arctic is seeing promising results. But scientists warn of big risks

Deep in the Canadian Arctic, scientists and entrepreneurs brave sub-zero temperatures, whipping winds and snowstorms to drill holes through the sea ice to pump out the seawater below and freeze it on the surface.

Deep in the Canadian Arctic, scientists and entrepreneurs bravesub-zero temperatures, whipping winds and snowstorms to drill holes through the sea ice to pump out the seawater below and freeze it on the surface. Some Arctic scientists and experts have criticized Real Ice’s methods as unproven at scale, ecologically risky and a distraction from tackling the root cause of climate change:fossil fuels. The ultimate plan is to automate the process using underwater drones, each about 6.5 feet long and powered by green hydrogen.These will melt holes in the ice from below using heated drills.

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