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So Slarty Bartfast, Douglas Adams 'HichHikers Guide to the Galaxy' original Earth designer with a particular penchant for designing fjords, must have known something. He did his job well.

Fjords act as global temperature regulators, being carbon sinks during interglacial periods and become carbon sources during glacial periods.

Fjords, small in size and number, are significant carbon reservoirs
https://www.sciencedaily.com/releases/2022/12/221208114757.htm
Fjords comprise a mere 0.1 percent of the surface area of the ocean yet store a whopping 11-12 percent of the carbon stored in the ocean. New research shows they sock away 18 million tons of carbon during interglacial periods, like the one we're in now.