Replant it for carbon credits I guess

Carbon price went over 100 euro per ton for the first time recently

Edit. Found this as well

>Kelp is used to make many products: toothpastes, shampoos, salad dressings, puddings, cakes, dairy products, frozen foods, and even pharmaceuticals

>Algin, an emulsifying and bonding agent, is extracted from kelp and used in these products. Kelp is also used as food on mollusk farms

So, used to grow more shellfish

https://oceanservice.noaa.gov/facts/pplkelp.html