This is the fifth dispatch in a series from Jeff Goodell, who is in Antarctica investigating the effect of climate change on Thwaites glacier.

Aboard the Nathanial B Palmer, the research vessel and icebreaker I’ve hopped on for a two-month journey to Antarctica, there is much talk about how the fate of the civilized world – or at least major coastal cities – may be determined by the movement of warm circumpolar deepwater currents under Thwaites glacier in West

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