Can seaweed save the world?

Search Youtube: "Can seaweed save the world?" Lots of solutions here

https://www.youtube.com/watch?v=HnEh_UJqJKw

03 Can Seaweed Save the World ABC 2017 1

This was 1 year ago. I wonder what has happened since?

So far I've learned:

Fish ponds create pollution: fish waste in water

Seaweed can take that pollution out of that water (aquaponics concept), and in turn produce... more seaweed

Seaweed can be fed to cows

Seaweed can be baked into biochar (and perhaps take the place of fly ash cement? )

Seaweed can be eaten by Humans (I hope with minimal plastic content )
We can grow seaweed in the Philippines, and it can be an export product of the floating cities
Maybe we can also create floating fish ponds...?

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Idea on farming kelp and selling it as animal feed

"Anyways; kelp field in deep ocean. Southern-California. In federal waters first.

And/or it can be in state waters if it is allowed. With the intention to move out of EEZ. Kelp would be grown from subsurface buoys to surface. It would be possible to moor a boat to the subsurface buoy. Kelp would be processed to something useful and can be sold to people in any country. I think, the simplest way to use kelp is farm animal feed. To harvest kelp, and dry it, bring it to port, and sell it. And Life Aquatic with Steve Zissou."