Denis-Huot / Bottlenose dolphin (Tursiops truncatus) playing in the waves of an oil tanker, Port Aransas, Texas, USA

Juergen Freund / Green turtles (Chelonia mydas) mating over coral reef, Sipadan Island, Sabah, Malaysia, June, Endangered species

Juergen Freund / Split level image of Papuan fisherman standing on his dugout canoe over shallow corals, New Ireland, Papua New Guinea, June 2010

Juergen Freund / Box jellyfish {Chironex sp.} in mangroves, split level, Australia

Peter Lewis / Hills reflected in Blea Tarn, Lake District, Cumbria, England, UK. October 2013.

Peter Lewis / Panoramic view of Blea Tarn, Lake District, Cumbria, England, UK. October 2013.

Kirkendall-Spring / Green River with distant Squaretop Mountain from Green River Lakes Campground, Wyoming, USA. September 2015.

Graham Eaton / Forest trees and peat, which were covered by the sea following the last ice age, exposed on beach at low tide, Borth, Wales. September.

Graham Eaton / Forest trees and peat, which were covered by the sea following the last ice age, exposed on beach at low tide, Borth, Wales. September.

Graham Eaton / Forest trees and peat, which were covered by the sea following the last ice age, exposed on beach at low tide, Borth, Wales. September.

Guy Edwardes / Sunset over The Brisons from Porth Nanven, Cot Valley, Cornwall, England, UK. September 20012.

Kirkendall-Spring / Mount Adams from Trout Lake Creek, Trout Lake, Washington, USA. October 2015.