About 93% of global warming goes into the surface layers of the ocean, cutting of circulation of nutrients, which has led to seaweed ecosystem and harvest reduction or collapse in different coastal regions (Australia, California,SE Asia for example). https://www.climatefoundation.org/ has developed a system to upwell water from beneath the thermocline over the past fifteen years. They have shown more than 3x growth over controls, and are looking to scale up and grow kelp offshore and in the open ocean.