Different species of brown macro-algae, but same in Spain in the lasts 15 years. Most submerged forests of Laminaria vanished.

It only takes a few degrees of temperature more and it seems that the young spores can't settle anymore. Brown algae have evolved to stand cold waters.

To exploit wild seaweed as a resource to feed millions of cows would create a plethora of new problems. Nobody would agree to abonate their meadow or orchard with a product with a high content of salt for example.