Life on Earth is shaped by water, and only survives here because of it, but our ocean ecosystems are at the epicentre of global warming. Framed by the need to protect our oceans, 'Water World' is natural-history illustrator Ben Rothery's rich exploration of the creatures from the coastal and offshore waters of the world - from penguins, seagulls, polar bears and seahorses, to plankton, sharks and deep-sea beings.