David Attenborough at 99: “Life will almost certainly find a way”

In Ocean , Attenborough and Colin Butfield turn their attentions to this last great wilderness.

We are beginning to realise just how much we rely on a healthy ocean and the amount of damage we are doing to it.

The deep ocean is certainly not the featureless abyss we once thought, but has remarkably different features and habitats.

Around 250 million years ago , the “ Great Dying ” killed 96 per cent of marine species, possibly as a result of global warming depriving oceans of oxygen.

Changes in oxygen levels in the ocean are causing profound problems, says John Murray .

Agricultural run-off, in particular fertiliser, creates algal blooms that quickly change the oxygen levels.