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Plants remove carbon dioxide from the atmosphere. Where can we get more plants?
Most of the ocean is far from dry land, and is a desert where ocean micro-plants cannot grow. These micro-plants need nutrients that come from land washing into the ocean. They need mud.
Could ocean waves provide power to lift mud up off the ocean floor and spread it over the surface of the ocean?
Another possible solution has been suggested by the book "climate restoration" by Peter Fiekowsky. Infinitesimal trace amounts of iron sulfate sprayed on the surface of the ocean could stimulate micro-plant growth.