Arctic ice is vanishing – our bold experiment is trying to protect it

By Shaun Fitzgerald, Director, Centre for Climate Repair, University of Cambridge

Like ice in a drink, Arctic sea ice keeps things cold – until it melts. Using the same principle, some scientists are investigating whether they can make sea ice thicker and better able to cool the planet. I recently returned from Cambridge Bay in the far north of Canada, where I saw some early experiments in practice.

Over the winter months, the build-up of sea ice around Cambridge Bay and across the Arctic helps keep the sea water underneath close to the freezing temperature, which for saltwater is around -1.8°C.

These conditions are broadly maintained even through the…

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