Steven Kazlowski / Polar bear (Ursus maritimus) young bear rolling around in the snow, on newly formed pack ice during autumn freeze up, Beaufort Sea, off Arctic coast, Alaska

Matthew Maran / Great created grebe (Podiceps cristatus) with chick following, and person swimming in pond, Hampstead Heath, London, July 2014.

Jean E. Roche / Giant mirror in the shape of a woman emerging from river, a public sculpture by Rob Mullholland, Port Saint Louis du Rhone, Camargue, France, May 2013. Editorial Use only. Credit Jean Roche / Le Citro...

Jean E. Roche / Woman looking into giant 'funhouse' mirror in forest, public sculpture by Rob Mullholland, Port saint Louis du Rhone, Camargue, France, May 2013. Editorial Use only. Credit Jean Roche / Le Citron Jaun...

Pete Oxford / Salt mounds and evaporation ponds (sea salt production plant started in the 1600's and worked by african slaves) Cargill Solar Salt Works, Pekelmeer lagoon, Bonaire, Netherlands Antilles, Caribbean

Andy Rouse / 2020VISION / European river otter (Lutra lutra) swimming, Dorset, UK, May. Did you know? Following efforts to save them from extinction, otters have now returned to every county in England – proof that conservatio...

Andy Rouse / 2020VISION / European river otter (Lutra lutra) swimming in lake with cub, Wales, UK, October. Photographer quote: "Rain, rain and more rain, a typical Welsh summers day,but even though I was soaked through I was...

Nick Garbutt / Sheep grazing in front of Cemex Cement Works and Limestone Crushing Plant with Lowther Valley and eastern Lake District behind. Shap Fell, Cumbria, UK. January 2009.

SCOTLAND: The Big Picture / Family mountain biking through forest, Cairngorms National Park, Scotland, UK, November 2011.

SCOTLAND: The Big Picture / Walker silhouetted at sunset on Braeriach, Cairngorms National Park, Scotland, UK.November

SCOTLAND: The Big Picture / Walker silhouetted at sunset on Braeriach, Cairngorms National Park, Scotland, UK.November

Neil Aldridge / Member of Botswana's Anti Poaching Unit keeps guard while a rhino monitor from the charity Rhino Conservation Botswana tracks a rhino in Okavango Delta, Botswana,. Rhino Conservation Botswana works ha...