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Current production shouldn't matter and the sea is huge - if the algae are uncomplicated to grow I don't see any reason why there should be a limit to future production.

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You mean other than the fact that techniques for efficiently growing such amounts of seaweed do not exist? Of the amount produced globally today, 90% comes from China, Korea, Japan, and the Philippines and that production is all very labor intensive and done in locations and using methods that are simply not applicable to the United States.

There is a huge about of R&D needed to get any of this to scale. Some of it is already underway.

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