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Iron seeding was tried--not a good idea.

Yes, it had the predicted effects in terms of plankton growth and the rest of the food chain. It did take a lot of CO2 out of the air. However, some of the animal life fell into the deep ocean and slowly decayed--releasing methane. Methane is a far worse greenhouse gas than CO2. Lots of fish but no climate benefit.

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I’d need a source for this, because this seems incorrect. Most of the captured carbon would enter a food cycle, and while some of it might become methane, much more of it would be constantly cycled in the ecosystem, and some would end up as calcium carbonate.

Most is--it's just the amount that escapes as methane produces as much greenhouse effect as the CO2 that was removed.

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