"Discusses the variety of living things in the ecosystem an ocean"--Provided by publisher.

Includes index.

What is biodiversity? -- Why is biodiversity important? -- Oceans and seas of the world -- Ocean and sea biodiversity -- Threats to oceans and seas -- Biodiversity threat : Overfishing -- Biodiversity threat : Plastic pollution -- Biodiversity threat : Oil and chemical pollution -- Biodiversity threat : Carbon dioxide -- Ocean and sea conservation -- Case study : The Red Seas? -- What is the future of oceans and seas?.