Great forests of ocean kelp were found in a recent study to be between 4 and 11-times more productive than the most productive crops grown today like wheat, corn, and rice.
On land, the fastest growth rates occur in the tropics, but in the ocean the most productive ecosystems are found in the temperate zones where cool, nutrient-rich waters create forests of golden, bull, and bamboo kelp that can grow 100 feet tall (35 meters).
This was the result of a global diving survey organized …