Antarctic melt: Excursion to the apocalyptic glacier

Glaciologists have called the Thwaites Glacier the "most important" glacier in the world, the "most risky" glacier and even the "apocalyptic" glacier.

Scientists from Great Britain and the USA are studying changes in glaciers as part of the Thwaites Glacier International Collaboration.

BBC chief environmental correspondent Justin Rowlatt visited the project.

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