Marine life halved: Brian Skerry's rare images of most endangered – in pictures

Marine life has been halved in a single generation, according to the WWF Living Blue Planet report. In 18 years as a National Geographic photographer, Brian Skerry has seen these losses. He's snapped the sub-marine world of Mexico, remote coral reefs in the central South Pacific, and countless endangered animals. Touring Australia, Skerry will speak on the value of storytelling, and how pictures can make a difference

• Brian Skerry to speak in Sydney 17 October, Perth 24 October and Melbourne 29 October