Sir David Attenborough

could take pictures of coral reefs but could not explain why they harboured such a wonderful array of diversity.

we have changed the ocean so profoundly that the next hundred years could either witness a mass extinction of ocean life or a spectacular recovery

We began to think of the ocean in terms of five major connected basins: Arctic, Atlantic, Indian, Pacific and Southern – though the Southern Ocean wasn’t officially recognised as a distinct ocean basin until 2021.