Geo-thermal power plant, Svartsengi, Iceland

Reconstruction of buildings, Los Millares prehistoric Chalcolithic settlement archaelogical site, Almeria, Andalusia, Spain, Europe

Stream with mossy rocks in a lush, green landscape in the Lake District, England, United Kingdom, Europe

Cactus plants inside Jardin de Cactus designed by Cesar Manrique, Guatiza, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Avola lakes, high angle view, Avola, Noto Valley, Sicily, Italy

Artesian well at Fayagua, between Pajara and La Pared, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Hiking trail from Niesen mountain, Canton of Bern, Switzerland

The Southern Patagonian Icesheet, one of the world's largest ice-caps, along the western edge of the Chalten Massif, Patagonia, Argentina

Paddy field rice farming terraces, Ella, Badulla District, Uva Province, Sri Lanka, Asia

Cutting Edge steel wall and cascading water feature outside Sheffield railway station, Sheffield Gateway, Sheffield, Yorkshire, England

Thangamale wildlife sanctuary sign, Haputale, Badulla District, Uva Province, Sri Lanka, Asia

Countryside landscape, near Huebro, Ruta del Agua, Sierra Alhamilla mountains, Nijar, Almeria, Andalusia, Spain, Europe

Lake Sandoval and Aguaje palms, Tambopata National Reserve, Puerto Maldonado, Madre de Dios, Peru, South America

Lake Sandoval and Aguaje palms, Tambopata National Reserve, Puerto Maldonado, Madre de Dios, Peru, South America

Bungalows of Ecohabs hotel overlooking the Carnaval beach, Tayrona National Natural Park, Department of Magdalena, Caribbean Region, Colombia, South America

Walking in Tayrona National Natural Park, Department of Magdalena, Caribbean Region, Colombia, South America

Lake Koman, a reservoir on the Drin River in northern Albania, surrounded by dense forested hills, vertical slopes, deep gorges, and a narrow valley, Albania, Europe

The Lindblad Expedition ship National Geographic Explorer in the Svalbard Archipelago, Norway, Arctic, Europe

The Lindblad Expedition ship National Geographic Explorer at Austfonna in the Svalbard Archipelago, Norway, Arctic, Europe

Little boat between the icebergs of the Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

Tourists hiking on the trail at Diana's Peak National Park, Saint Helena, South Atlantic Ocean

Archaeological site of Ollantaytambo, Ollantaytambo District, Sacred Valley, Urubamba Province, Cusco (Cuzco) Region, Peru, South America

Walking path leading through the gorge of Los Cahorros Monachil, Monachil, Sierra Nevada, Granada, Andalusia, Spain, Europe

The endemic lava cactus (Brachycereus spp) cactus growing in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Dolbadarn Castle and the Llanberis Pass, near Llanberis, Snowdonia National Park (Eryri), North Wales, United Kingdom, Europe

Aerial view of a winding mountain road curves, Kalmak Ashuu Pass, through lush greenery in Kyrgyzstan, Central Asia, Asia

Palm trees on Yacumama Lake, Puerto Maldonado, Tambopata Province, Madre de Dios, Peru, South America

Banos de Agua Santa, Tungurahua Province, Ecuador

Sheep at Inishbofin island, Connemara, County Galway, Connacht, Republic of Ireland

Barnaderg Bay around Letterfrack, Connemara National Park, Connemara, County Galway, Connacht, Republic of Ireland

Elevated view of stalls and people in Omicho Market, Kanazawa City, Ishikawa Prefecture, Honshu, Japan

La Miroiterie building designed 2006 by Ueli Brauen and Doris Walchli, Le Flon district, Lausanne, Canton of Vaud, Switzerland

Alila Jabal Akhdar hotel, nestled 2000 metres above sea level, surrounded by Al Hajar Mountains, Sultanate of Oman, Arabian Peninsula

Al Hajir seen from track (Al Barida Road) on western slope of Djebel Ahkdar below Sharaf al Alamayn Pass, 2036m, Oman, Arabian Peninsula

Al Mudhaireb Village, Al Sharqiyah region, Sultanate of Oman, Arabian Peninsula

Sama Wakan Heritage hotel, Wakan village, Western Hajar Mountains, South Batinah and Al Dakhiliyah Governorates, Oman, Arabian Peninsula

Bicycles available on rent in Nagao Beach to stop air pollution caused by fossil fuel vehicles, Nagao Beach, Diu, India, Asia

Swimming pool, Our Habitas AlUla, sustainable desert luxury resort in ancient oasis in canyons of the Ashar Valley, Medina Province, Saudi Arabia

Aerial view over Gardens by the Bay and supertree grove, Singapore

Ribera dos Caldeiroes waterfalls, near Achada, Sao Miguel, Azores Islands, Atlantic, Portugal

Akha hill tribe woman, originally from Myanmar, selling her handicraft goods in Baan Tong Luang eco village near Chiangmai, Thailand

Adult fin whale (Balaenoptera physalus) sub-surface feeding in the rich waters off the Svalbard Archipelago, Norway

Ruined village of Hara in the large palm grove in Agdz, Mount Kissane (Djebel Kissane), Draa-Tafilet region, Morocco

Bungalow room of Eco-lodge Hara Oasis on River Draa banks in large palm grove in Agdz at foot of Djebel Kissane (Mount Kissane), Draa-Tafilet region, Morocco

Eco-lodge Hara Oasis on River Draa banks in large palm grove in Agdz at foot of Djebel Kissane (Mount Kissane), Draa-Tafilet region, Morocco

Villagers carrying fodder on donkeys, village on the road from Agdz to Zagora, Draa River valley, Province of Zagora, Region Draa-Tafilalet, Morocco

Sacks of dates, palm grove of Zagora, Draa River valley, Province of Zagora, Region Draa-Tafilalet, Morocco

Electric mountain biker off the road from Zagora to the south (N 9), Draa River valley, Province of Zagora, Region Draa-Tafilalet, Morocco

Casa Juan, guesthouse at Ait Isfoul, Nesrate village on edge of Sahara desert, Draa River valley, Province of Zagora, Region Draa-Tafilalet, Morocco

Electric mountain bike rider on track between Ouarzazate and Ait Ben Haddou, Ounila River valley, Ouarzazate Province, Draa-Tafilalet region, Morocco

Electric mountain bike rider on track between Ouarzazate and Ait Ben Haddou, Ounila River valley, Ouarzazate Province, Draa-Tafilalet, Morocco

Ksar of Ait-Ben-Haddou, UNESCO, Ounila River valley, Ouarzazate Province, region of Draa-Tafilalet, Morocco

Bikers on the unpaved road going up from Anmiter to the village of Tighza, Ouarzazate Province, region of Draa-Tafilalet, Morocco

Lunch break, group of bikers, road from Telouet to Tighza, Ouarzazate Province, region of Draa-Tafilalet, Morocco

View of the Harpa Concert Hall and Conference Centre, Reykjavik, Iceland

View of the sea cliffs just outside of Westmanna on the west side of Streymoy Island in the Faroe Islands, Denmark

Majestic red rock spires in Kok-Moinok Canyon, Kyrgyzstan, Central Asia, Asia

Aerial of a cruise ship anchoring in Wulaia Bay, Tierra del Fuego, Chile, South America

Earthenware jars around village of Omodos, Troodos Mountains, Cyprus, Eastern Mediterranean Sea, Europe

Anfi del Mar, Playa de la Verga, Arguineguin, Gran Canaria, Canary Islands, Spain, Atlantic, Europe

Nature Park Valsesia and the Alta Val Strona, close-up off the glacier of Monte Rosa in the Italian Alps, Piedmont, Italy, Europe

Landscape scarred by mining and spoil heaps at former mining settlement where gold and other minerals were extracted, and second highest village in Scotland, Leadhills, South Lanarkshire, Scotland, United Kingdom, Europe

Las Terrazas, Sierra del Rosario Biosphere Reserve, Artemisa Province, Cuba, West Indies, Caribbean, Central America

Floating icebergs in the Nuuk Icefjord, Western Greenland, Denmark, Polar Regions

Black pearl, Praslin Island, Republic of Seychelles, Indian Ocean, Africa

Views of visitor lodging on Ile des Oiseaux (Bird Island) in the Parc National du Delta du Saloum, UNESCO World Heritage Site, Senegal, West Africa, Africa

El Misti volcano rising above the white city of Arequipa, UNESCO World Heritage Site, Arequipa, Peru, South America

Tourists photographing a wild Galapagos giant tortoise (Geochelone elephantopus) feeding on the upslope grasslands of Santa Cruz Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Guest from the Lindblad Expedition ship National Geographic Endeavour in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Hikers on ancient path used by villagers to cross the island North to South, on the heights of Santana, Madeira island, Atlantic Ocean, Portugal

Herd of alpacas, near Rainbow Mountain, Pitumarca District, Cusco (Cuzco) Region, Peru, South America

Cadagno lake, Piora valley, Canton Ticino, Switzerland

Young woman visiting apple orchard, Lerchnhof Farm Inn, Valdaora di Sotto, South Tyrol (Alto Adige), Italy

Village of Misfat (Misfah) Al Abriyeen in Jebel Akhdar, gradually renovated, Sultanate of Oman, Arabian Peninsula

Alila Jabal Akhdar hotel, nestled 2000 metres above sea level, surrounded by Al Hajar Mountains, Sultanate of Oman, Arabian Peninsula

Wakan village, Western Hajar Mountains, border South Batinah Governorate and Al Dakhiliyah Governorates, Sultanate of Oman, Arabian Peninsula

Riserva Naturale di Punta Bianca, Palma di Montechiaro, Agrigento, Sicily, Italy

Swimming pool, surrounded by sandstone rock structures, Our Habitas AlUla, oasis in canyons of the Ashar Valley, Medina Province, Saudi Arabia

Swimming pool, surrounded by sandstone rock structures, Our Habitas AlUla, oasis in canyons of the Ashar Valley, Medina Province, Saudi Arabia

Avola lakes, high angle view, Avola, Noto Valley, Sicily, Italy

Traditional barn-fortress for crop harvesting, Tallate, Anti-Atlas, Morocco

Underwater view of the reef along the circumference of the Great Blue Hole on Lighthouse Reef, UNESCO, Belize

Riders on mountain bike with electric assistance, Ounila River valley, Ouarzazate Province, region of Draa-Tafilalet, Morocco

Kok-Moinok Canyon, a clay-sand structure formed on the slopes of arid mountains cut by water streams, Kyrgyzstan, Central Asia, Asia

Aerial of a dugout canoe on the Congo River, Mbandaka, Equateur province, Democratic Republic of Congo, Africa

Aerial of Slansko Lake, Montenegro, Europe

Sea urchins just caught and opened showing the edible cores (uni), Perna inlet, Palmizana, St Clement island, Hell's Islands (Pakleni), Hvar city, Hvar island, Croatia, Southeast Europe

Boat trip on Kourou River, French Guiana, Overseas department and region of France, French Guiana, South America

Perast on the Bay of Kotor, UNESCO World Heritage Site, Montenegro, Europe

A tourist in Jardin de Cactus, Guatiza, Lanzarote, Canary Islands, Spain, Atlantic, Europe

A view of the expedition ship Ulla Rinman operating in the Svalbard Archipelago, Norway, Arctic, Europe

Ferry service on the Aurlandsfjord, an arm of the Sognefjord, the largest fjord in all of Norway, Vestland, Norway, Scandinavia, Europe

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

The very colorful Galapagos land iguana (Conolophus subcristatus) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Unusual dinghy driving in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Tourist lodge near the Eqi glacier, Ilulissat, Western Greenland, Denmark, Polar Regions

Guest from the Lindblad Expedition ship National Geographic Explorer holding ice in the Svalbard Archipelago, Norway, Arctic, Europe

Feynan Ecolodge located on the Wadi Feyman banks, Dana Biosphere Reserve, Jordan, Middle East

Bubble tents camp in Wadi Rum, UNESCO World Heritage Site, Jordan, Middle East

Tourists at Green Sea Turtle (Chelonia mydas) nesting site at night on Long Beach on Ascension Island, Tropical Atlantic Ocean, South Atlantic Ocean