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British and South Korean scientists are drilling through the Thwaites glacier, in one of the most remote parts of Antarctica, to understand why and how it is melting.
Thwaites is in danger of collapsing due to climate change, and if that happens it could lead to higher global sea levels, and flooding in the world's biggest coastal cities.
We spoke to the BBC's climate editor, Justin Rowlatt - one of the few journalists to have visited the Thwaites glacier.
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