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New islands grow enough to be colonized, and old islands are overcome by the sea. Anyone who has observed a section of coastline over weeks knows how this works.

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I didn't get the impression from the blog post that island evacuation happens every few weeks. In fact, "first" suggest something opposite of that is true. Can you explain why you consider this even normal, obvious and happening regularly?

You misread OP, it's not that it happens every few weeks, but watching the coastline can hint at the trend over geologic time of islands appearing and disappearing

I think with the intent of downplaying the rising-sea-levels angle, since islands can also erode or sink

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