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This is a myth. They did a study last decade that showed Tuvalu is actually gaining landmass.

[0] https://phys.org/news/2018-02-pacific-nation-bigger.html

The PM at the time took contention to the publication of that article, saying that there was no increase in actual habitable land.

https://web.archive.org/web/20190326140508/https://kmt.news/...

Yup. The study suggests that it's just the peaks getting higher, which means that even the peaks will become harder to build on as they become steeper.

Useful inhabitable landmass is the question I guess? If it's just the peaks of the island getting higher, then that land becomes increasingly hard to build on.

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