Sea otters may seem like not a like an important animal in the Eco system, sure they build dams. But most people think that is it, although they do a lot more and effect the Co2 level in a indirect way. Since sea urchins eat sea kelp and recent research shows that kelp absorb Co2 thought photosynthesis. Even though the amount of Co2 removed a little if we have lots of Co2 in the atmosphere, which we do see it docent affect it that much but its enough to make a difference. I think that this can be good if we stop polluting then the plant can slowly recover.
Your post doesn't tell me how sea otters reduce carbon dioxide? Do they eat sea urchins?
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