A chance discovery of some kelp that floated for 20,000km before washing up on an Antarctic beach has opened up a new chapter in our understanding of the currents that swirl around the Southern Ocean.
Climate change affects kelp forests all over the world differently. In southern Africa, they seem to be thriving which should be good news. The marine life relying on kelp, are however struggling.
Cool-water kelp forests are being eaten by tropical species moving south on warming waters.
A 10-week surge in ocean temperatures off the Western Australian coast has killed off large patches of kelp forest, the "biological engine" of Australia's southern reefs.