Kelp absorbs carbon dioxide and has high nutritional value, but it is under threat from rising temperatures, pollution and invasive species
Bubbles stream furiously behind Frank Hurd as he gently parts the curtains of giant kelp. Green and gold ribbons reach upwards through the cold waters of the Pacific Ocean towards the sun.
Hurd, a marine biologist with environmental organisation the Nature Conservancy, is diving in a kelp forest off Anacapa Island, one of the protected rocky volcanic islets that form the Channel Islands national park, an archipelago off the coast of southern California. This thick, healthy kelp – a type of seaweed – forms a small part of underwater forests that blanket the coastline of nearly every continent. Some are relatively well-studied, including the Great African Sea Forest, a rich stretch of giant bamboo kelp spreading north from Cape Town to the Namibian coastline that was the setting for the film My Octopus Teacher; and the Great Southern Reef, a giant kelp forest hugging Australia’s southern coastline.
A harbour seal descends from the kelp canopy in the rich underwater forests off Santa Barbara, California.Despite being one of the fastest growing plants on Earth, kelp has historically been difficult to map because of the difficulties of measuring ocean depths with satellites.
Still from My Octopus Teacher, set in a rich stretch of giant bamboo kelp spreading north from Cape Town to the Namibian coastline.Seaweed forests can act as a vital buffer against the climate crisis, absorbing carbon dioxide from seawater and the atmosphere.
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