Ingo Arndt / Grizzly Bear (Ursus arctos horribilis) digging for clams on tidal flats, Lake Clark National Park, Alaska.

Cheryl-Samantha Owen / Shark spotter, in front of black flag at the Kalk Bay post. It provides a warning to ocean goers that visibility is bad and the shark spotters may not see a white shark if it does enter the bay. West...

Alex Hyde / Red Deer herd (Cervus elaphus) moving over mountain ridge in heavy snow. Cairngorms National Park, Scotland. January. Highly Commended in the Habitat category of the British Wildlife Photography Award...

Juan Carlos Munoz / European beech forest (Fagus sylvatica) in autumn, view from below in the mist, Ilirska Bistrica, Green Karst, Slovenia, October.

Andrew Parkinson / Brown hare (Lepus europaeus) three adults in snow covered field during a snow fall, Derbyshire, UK, February.

Enrique Lopez-Tapia / Giant lobelia (Lobelia rhynchopetalum) flower spikes in mist, Sanetti Plateau, Bale Mountains National Park. Ethiopia, November 2014

Alex Hyde / Red deer herd (Cervus elaphus) moving over mountain ridge in heavy snow. Cairngorms National Park, Scotland. January.

Sven Zacek / Two Roe deer (Capreolus capreolus) sniffing each other in the snow, Vorumaa, Estonia, January. Winner of the Animal stories portfolio in the Melvita Nature Images Awards competition 2014.

Peter Cairns / Bison (Bison bison) standing in geothermal run-off in winter, Yellowstone National Park, Wyoming, USA, February.

Juan Carlos Munoz / View of tropical rainforest trees shrouded in mist, Danum Valley Conservation Area, Borneo, Malaysia.

Alex Mustard,Alex Mustard / A diver and a hydrothermal chimney. Note that he is obscured by the different temperature waters (from the chimney and the surrounding water) which are unable to mix. The sea water was 4 degrees Celsi...

Orsolya Haarberg,Orsolya Haarberg / Alpine ibex (Capra ibex) in snowing conditions, the Alps, Gran Paradiso National Park, Italy. October 2008

Steven Kazlowski,Steven Kazlowski / Polar bear (Ursus maritimus) curious adult head underwater, Beaufort Sea, off the 1002 area of the Arctic National Wildlife Refuge, North Slope, Alaska.

Juan Carlos Munoz,Juan Carlos Munoz / Hikers climbing Mount Etna in the mist, Etna, Sicily, Italy, October 2007

Igor Shpilenok,Igor Shpilenok / Kamchatka Brown Bear (Ursus arctos beringianus) sitting in heavy snowfall. Kronotsky Zapovednik Nature Reserve, Kamchatka Peninsula, Russian Far East, December.

Sven Zacek,Sven Zacek / European Hare (Lepus europaeus) beyond a hay bale in foggy meadow. Northern Latvia, July.

Sven Zacek,Sven Zacek / Famous Puhajarve war oak (Quercus) seen through dense fog. Southern Estonia, April 2011.

Roy Mangersnes / Mountain tops in clouds at sunset over Raudefjorden, Northern Spitsbergen, Svalbard, Norway, September

Roy Mangersnes / Person standing on Pulpit Rock, 604 meters above the Lysefjorden covered in mist, Rogaland, Norway

Roy Mangersnes / Mist above Monaco Glacier, North west of Spitsbergen, Svalbard, Norway, August

Steven Kazlowski / Walrus (Odobenus rosmarus) two young bulls, in waters along Spitsbergen and the northwestern coast of the Svalbard Archipelago, Norway, Arctic Ocean, July

Benjam Pontinen / Brown hare (Lepus europaeus) running past hay barn in snow storm, Lapua, Finland, March. WINNER, Animals in their Environment category, 2011 WILDLIFE PHOTOGRAPHER OF THE YEAR competition

David Woodfall / Upland conifer plantation in snow and mist, Gwynedd, North Wales, February 2009

Eric Baccega / View from deck of a cruise ship cruising along Baffin Island with an iceberg emerging out ot the mist, Nunavut, Canada, August 2010

Pete Oxford / Forest vegetation in mist on the western slope of the Mindo Cloud Forest, Ecuador, South America

Sven Zacek / Snowy owl (Bubo scandiaca) perched on tree stump, in snow, Ontario, Canada.

Edwin Giesbers / Siberian tiger (Panthera tigris altaica) walking in snowstorm, captive

Roy Mangersnes / Man outside cabin in snowstorm, Agardh Bay, East coast of Spitsbergen, Svalbard, Norway, March 2009. Model released

Jeff Vanuga / Two male Elk {Cervus canadensis} in velvet, resting in foggy meadow at dawn, Yellowstone National Park, Wyoming, USA, July

Ashley Cooper / Misty light over the Modi Khola valley below the Annapurna Sanctuary, Himalayas, Nepal. December 2012.

Ashley Cooper / Looking towards Black Fell in the North Pennines, from Hartside, Cumbria, UK. January 2016.

Ashley Cooper / Looking towards the Lake District hills from Hartside in the North Pennines, England, UK, January.

Ashley Cooper / Looking down from Moro Rock at sunset, Sequoia National Park California, USA, October 2014.

Ashley Cooper / Trees in plantation burning in forest fire, Egremont, Cumbria, England, UK, August 2006.

Ashley Cooper / Trees in plantation burning in forest fire, Egremont, Cumbria, England, UK, August 2006.

Ashley Cooper / Climber with spindrift during high winds moving snow above Grasmere, Lake District, England, UK. December 2010

Ashley Cooper / A climber being blasted by spindrift during high winds moving snow above Grasmere, Lake District, UK. December 2010

Ashley Cooper / Climberwith spindrift during high winds moving snow above Grasmere, Lake District, UK. December 2010

Ashley Cooper / Climbers in spindrift during high winds moving snow above Grasmere, Lake District, UK. December 2010

Ashley Cooper / Air pollution from the Syncrude upgrader plant which processes tar sand for the production of synthetic oil. Alberta, Canada. August 2012

Ashley Cooper / Air pollution from the Syncrude upgrader plant which processes tar sand for the production of synthetic oil. Alberta, Canada. August 2012

Ashley Cooper / Aeroplane on the runway at East Midlands Airport in foggy conditions. December 2006

Ashley Cooper / Cars driving on the M1 motorway, near Loughborough in evening fog. England, UK, December 2006

Ashley Cooper / Mist caused by a temperature inversion over woodland near Ambleside, Lake District, England, UK. November 2009

Ashley Cooper / Scots pine (Pinus sylvestris) and valley mist near Rydal, Lake District, England, UK. November 2009

Ashley Cooper / Mist caused by a temperature inversion over Ambleside in the Lake District, England, UK. November 2009

Ashley Cooper / Employee of Cumbria County Council clearing snow from the blocked Kirkstone Pass, the highest mountain pass in the Lake District, England, UK. January 2010

Ashley Cooper / The Kentmere fells from Kirkstone Pass which has been completely blocked by arctic winter conditions, Lake District, UK. January 2010

Ashley Cooper / Belted Galloway cattle on the side of Kirkstone Pass in the Lake District, which has been completely blocked by snow. Cumbria, England, UK. January 2010

Ashley Cooper / The Kentmere Fells above Troutbeck in full winter conditions, Lake District, England, UK. January 2010

Ashley Cooper / Cumbria County Council clearing snow from the blocked Kirkstone Pass, the highest mountain pass in the Lake District, England, UK. January 2010

Ashley Cooper / Cumbria County Council clearing snow from the blocked Kirkstone Pass, the highest mountain pass in the Lake District, England, UK. January 2010

Ashley Cooper / Spindrift blowing across the lower part of the Kirkstone Pass in troutbeck, Lake District, England, UK. January 2010

Ashley Cooper / Field in Troutbeck with snow and spindrift blown across the hill side, Lake District, England, UK. January 2010

Ashley Cooper / Wansfell on the side of Kirkstone Pass in the Lake District, with snow and spindrift being blown across the hill side, England, UK. January 2010

Ashley Cooper / Wansfell on the side of Kirkstone Pass in the Lake District, with snow and spindrift being blown across the hill side, England, UK. January 2010

Ashley Cooper / Red Screes and the Kirkstone Pass road blocked by snow in the Lake District, England, UK. January 2010

Ashley Cooper / The Kirkstone Pass Inn, plastered in fresh snow after overnight snow storms and with spindrift from drifting snow in windy conditions in the Lake District, Cumbria, UK. January 2016

Ashley Cooper / Mist over Todd Crag above Ambeside in the Lake District, England, UK, November 2012

Ashley Cooper / A snow plough driving in heavy snow, clearing the road in Ambleside, England, UK. March 2006

Ashley Cooper / Smoke warning sign by road, at dawn near Orbost, New South Wales, Australia. March 2010.

Ashley Cooper / Smoke warning sign by road, at dawn near Orbost, New South Wales, Australia. March 2010.

Ashley Cooper / Dust storm sweeping across highway in Inner Mongolia during severe drought, China, March 2009.

Ashley Cooper / Sand dunes spreading across highway during severe drought, Inner Mongolia, China. March 2009.

Ashley Cooper / Sand dunes spreading across highway during severe drought, Inner Mongolia, China. March 2009.

Ashley Cooper / Dust storm blowing sand across highway in Inner Mongolia during severe drought, China, March 2009.

Ashley Cooper / Wind farm seen through haze of a dust storm. Inner Mongolia, China, March 2009.

Ashley Cooper / Almond (Prunus amygdalus) groves with dust storm during the 2011-17 California drought. Almonds take large amounts of water to grow and rely on irrigation to grow. Wasco, Central Valley, California, U...

Ashley Cooper / Burning brush wood from a forestry plantation near Egremont, Cumbria, England, UK, August.

Tony Wu / Ama diver searching rocks for shellfish including Sea snails (Turbo sazae) in decreasing visibility. Futo Harbour, Izu Peninsula, Honshu, Japan. June 2010.

Pat Tuson / Group of school children wearing high visibility jackets crossing the road, sometimes called walking bus, Hyde Park Corner, London, UK, June 2015.

SCOTLAND: The Big Picture / High visibility deer fencing used in woodland where Capercaillie (Tetrao urogallus) and Black grouse (Tetrao tetrix) may be present to reduce risk of these birds flying into the structures and dying....

Carol Walker / Head portrait of grey almost white Andalusian mare running in snow, Berthoud, Colorado, USA. January.

Franco Banfi / Scuba diver in the Silfra Lagoon, with a shallow sandy bottom, visibility stretching to 120m, Thingvellir National Park, Iceland.

Nick Turner / Selsley church shrouded in mist, Selsley Common, Gloucestershire, UK. November.

Nick Turner / Hand selection of limestone for construction and dry stone walling, Huntsmans Quarry, Naunton, Gloucestershire, UK. July 2015.

Nick Turner / Hand selection of limestone for construction and dry stone walling, Huntsmans Quarry, Naunton, Gloucestershire, UK. July 2015.

Nick Turner / Rain storm across Gloucestershire countryside at Dover's Hill, Chipping Campden, Gloucestershire, UK. May 2015.

Tony Wu / Humpback whale calf (Megaptera noavaeangliae) suckling in dark water with low visibility. Vava'u, Tonga, Pacific Ocean.

Tony Wu / Humpback whale calf (Megaptera noavaeangliae) nursing in dark water with low visibility. Vava'u, Kingdom of Tonga. Pacific Ocean.

Kirkendall-Spring / Rialto Beach near Hole-In-The-Wall. Olympic National Park, Washington, USA. August 2015.

Erlend Haarberg / Charcoal burner arranging a pile of burning wood, silhouetted in morning light with shadow on smoke, Calonda, Harghita, Transylvania, Romania, June 2015.

Claudio Contreras / Bull shark (Carcharhinus leucas) Playa del Carmen, Caribbean Sea, Mexico, January.

Ben Hall / Eurasian lynx (Lynx lynx) in mist shrouded forest at dawn. Captive, Bavarian Forest National Park, Germany. October.

Cheryl-Samantha Owen / Green flag emblazoned with the outline of a white shark means conditions, such as water visibility, the degree of wind, cloud cover or sun reflection on the waters surface, would allow surfers to spot...

Cheryl-Samantha Owen / Black flag with the outline of a white shark means conditions, such as water visibility, the degree of wind, cloud cover or sun reflection on the waters surface, would not allow surfers to spot any sh...

Cheryl-Samantha Owen / Dennis Chikodze hoists the black flag at the Kalk Bay post. It provides a warning to ocean goers that visibility is bad and the shark spotters may not see a white shark if it does enter the bay. West...

Alex Mustard / Indo-Pacific sergeants (Abudefduf vaigiensis) swimming in mix of salt and freshwater, which is creating a haze in the water. Tulamben, Bali, Indonesia. Java Sea.

Mark Bowler / Aerial view of Amazon Rainforest, and the Manati River, Peru, July 2015.

Bruno D'Amicis / Sun filtering through sand during severe sandstorm. Grand Erg Oriental, Tunisia

Dong Lei / Mount Gyala Peri in mist, Yarlung Zangbo Grand Canyon National Park, Nyingchi Prefecture, Tibet, China. October 2010.

Andrew Parkinson / Brown hare (Lepus europaeus) adult male hunched down during strong winds and wind blown snow. Derbyshire, UK, March.

Andrew Parkinson / Brown hare (Lepus europaeus) boxing behaviour in a snow covered field, Derbyshire, UK, March.

Peter Cairns / Fulmar (Fulmarus glacialis) flying through waterfall, Iceland, March.

Juergen Freund / Black kites (Milvus migrans) gathering in flocks around bush fire to prey on small animals as these flee the flames, Queensland, Australia.

Claudio Contreras / Waterfowl at dawn with mist, including Great blue heron (Ardea herodias herodias), American avocet (Recurvirostra americana), Northern shoveler (Anas clypeata), Xochimilco wetlands, Mexico City, Mexic...