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They will get crushed by a newfangled invention called "plants".

Ah but we need to eat the plants. We can put factories that create fuel out of nothing in the middle of the ocean, where we can't grow corn.

Heh. But good point.

What is the most efficient plant that can sequestrate the carbon at the same rate?

Same rate? Well hard to say, but micro algal reactors can get pretty efficient, albeit at high cost - but that's a moot point in this scenario.