David Noton / Durdle Door at dusk, Jurassic Coast (UNESCO World Heritage Site), Dorset, England, UK

Willem Kolvoort / Tutu creek near Aurora, Suriname, September 2012.

Daniel Heuclin / Texas horned Lizard (Phrynosoma cornutum) in defensive posture, near Alamogordo. New-Mexico

Carol Walker / Black horse on ranch, Jackson Hole, Wyoming, USA

Onne van der Wal / Hunt Yachts HBI (Hard Bottom Inflatable) beneath the Newport Bridge, Rhode Island, USA, July 2011. All non-editorial uses must be cleared individually.

Mark Hamblin / 2020VISION / Snow-covered Scots pine trees (Pinus sylvestris) on the edge of Loch Morlich, Cairngorms National Park, Scotland, UK, February 2010

Juan Carlos Munoz / Small pool coloured red by dissolved minerals. Near the Rio Tinto, Andalusia, Spain, January 2008.

Bryan and Cherry Alexander / Sunset at a Nenets reindeer herder's winter camp on the tundra near Tambey. Yamal Peninsula, Western Siberia, Russia, March 2011

Lassi Rautiainen / Woodland bog with melting ice and snow, Northern Finland, April 2010

Charlie Summers / Two wild horses / Mustang (Equus caballus) stallions in dominance fight, Montana, USA

Andrew Walmsley / Temperate rainforest, Arthur's Pass NP, South Island, New Zealand, February 2010

David Woodfall / Severn Estuary tidal patterns, England, August 2009

Bryan and Cherry Alexander / Yaks climbing to summer pastures on the Nimaling Plateau. Ladakh, Northern India.

Luiz Claudio Marigo / Rock formation created by erosion in Sete Cidades National Park, municipality of Piracuruca, Piaua­ State, Northeastern Brazil. March 2009

Luiz Claudio Marigo / Sand dunes and lagoons of rain water in Jericoacoara National Park, municipality of Jijoca de Jericoacoara, Ceara¡ State, Northeastern Brazil. March 2009

Robert Thompson / View of Tory Island from Dun Bhaloir, County Donegal, Republic of Ireland, June 2008

Robert Thompson / Coastal landscape, Dun Bhaloir, Tory Island, County Donegal, Republic of Ireland, June 2008

Robert Thompson / Limestone pavement beside Lough Gealain, Burren National Park, County Clare, Republic of Ireland, November 2008

Robert Thompson / Hazel and Birch woodland, Murlough Bay, County Antrim, Northern Ireland, UK, May 2006

Robert Thompson / Glenariff glen, County Antrim, Northern Ireland, May 2008

Guy Edwardes / View from the summit of Corn Du towards The Black Mountain in winter at sunset, hard rime ice formations in foreground, Brecon Beacons National Park, Powys, Wales, UK, October 2008

Guy Edwardes / Sunset over Kimmeridge Bay, Isle of Purbeck, Jurassic Coast World Heritage Site, Dorset, England, April 2009

Guy Edwardes / Llwyn-on reservoir, Merthyr Tydfil, Brecon Beacons National Park, Wales, UK, autumn

Juan Manuel Borrero / Rainforest in Tambopata National Reserve, Peru

Staffan Widstrand / Ancient Olive tree {Olea europaea} Zakynthos, Greek island, Greece

Ross Hoddinott / Megavissey harbour, Cornwall, UK.

Ross Hoddinott / Megavissey harbour, Cornwall, UK.

Pete Oxford / Darwin Bay, Tagus Cove, Isabela Island, Galapagos Is.

Mike Read / New Forest ponies and foal by the Ober Water stream, Ober Corner, near Brockenhurst, New Forest National Park, Hampshire, UK, May 2008

Visuals Unlimited / Farmers planting Maize with oxen, Malealea, Lesotho, S Africa

Visuals Unlimited / Fish River Canyon, Namibia, SW Africa

Visuals Unlimited / Linear sand dunes in the Namib Naukluft National Park, Namibia, SW Africa

Visuals Unlimited / Sand dunes of the Sahara Desert, Erg Chebbi, Morocco, North Africa

Visuals Unlimited / Sand dunes in the Namib Naukluft National Park viewed from a hot air balloon, Namibia, SW Africa