Steven Kazlowski / Polar bear (Ursus maritimus) sow with two juveniles walk along the ice edge during autumn freeze up, Beaufort Sea, off Arctic coast, Alaska

Enrique Lopez-Tapia,Enrique Lopez-Tapia / Gentoo penguin (Pygoscelis papua) and Antarctic cruise liner 'MV Ushuaia' in Neko Harbour, Andvord Bay. Antarctic Peninsula, Antarctica

Franco Banfi / Blue-dash fusilier (Pterocaesio tile) Maldives, Indian Ocean

Stephen Dalton / Head of Horsefly (Tabanus sp) showing compound eyes, UK

Gary K. Smith / Potting Tomato seedling {Solanum lycopersicum} 'Ailsa craig' variety, in greenhouse, UK, March

David Woodfall / Wind turbine construction on former forestry in Upland Wales, Denbighshire, Wales, UK. August 2017.

Ashley Cooper / Protesters campaigning against fracking by Cuadrilla, as Cuadrilla appeals the local council decision not to allow fracking. Lancashire, England, UK, February 2016.

Ashley Cooper / Protesters campaigning against fracking by Cuadrilla, as Cuadrilla appeals the local council decision not to allow fracking. Lancashire, England, UK, February 2016.

Zoltan Nagy / Carrion Crow (Corvus corone) encircled by flock of Starlings (Sturnus vulgaris) resting on the beach in Blackpool, England, October.

Onne van der Wal / Sail boat 'Decision' races with a white spinnaker out during the 2013 Key West Race Week, Florida. All non-editorial uses must be cleared individually.

Onne van der Wal / 'Decision' races in Key West Race Week 2013, Florida. All non-editorial uses must be cleared individually.

Benoit Stichelbaut / Skipper Pascal Bidegorry checking the sails aboard Decision 35 yacht "Banque Populaire". Challenge Julius Baer race, Geneva, May 2009.