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Black-browed albatross (Thalassarche melanophrys) breeding colony on Steeple Jason Island in the Falkland Islands

Black-browed albatross (Thalassarche melanophrys) breeding colony on Carcass Island in the Falkland Islands

Black-browed albatross (Thalassarche melanophrys) breeding colony on Carcass Island in the Falkland Islands

Southern Right Whale (Eubalaena australis) adult surfacing near Puerto Pyramides, Peninsula Valdez, Argentina

Southern right whale (Eubalaena australis) adult surfacing near Puerto Pyramides, Peninsula Valdez, Argentina

The fire watchtower on the summit of Apache Maid Mountain, Coconino National Forest, Arizona, United States of America

Twin Erratic boulders high above Nant Ffrancon valley, Snowdonia National Park (Eryri), North Wales, United Kingdom

View of snow covered Aosta Valley from Pavillon du Mont Frety in winter, Courmayeur, Aosta Valley, Italian Alps, Italy

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

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

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

Nurse sharks (Ginglymostoma cirratum), being fed in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Nurse sharks (Ginglymostoma cirratum), being fed in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Nurse sharks (Ginglymostoma cirratum), being fed in shark and ray alley, Caye Caulker, Mesoamerican Barrier Reef, Belize

Nurse shark (Ginglymostoma cirratum), on the sand in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Tourist hand-feeding magnificent frigatebird (Fregata magnificens), at feeding station, Mesoamerican Barrier Reef, Belize

Glacial iceberg detail from ice calved off the Sawyer Glacier in Tracy Arm, Southeast Alaska, United States of America

Glacial iceberg detail from ice calved off the Sawyer Glacier in Tracy Arm, Southeast Alaska, United States of America

Glacial iceberg detail from ice calved off the Sawyer Glacier in Tracy Arm, Southeast Alaska, United States of America

Glacial iceberg detail from ice calved off the Sawyer Glacier in Tracy Arm, Southeast Alaska, United States of America

Glacial iceberg detail from ice calved off the Sawyer Glacier in Tracy Arm, Southeast Alaska, United States of America

Glacial iceberg detail from ice calved off the Sawyer Glacier in Tracy Arm, Southeast Alaska, United States of America

Glacial iceberg detail from ice calved off the LeConte Glacier near Petersberg, Southeast Alaska, United States of America

Glacial iceberg detail from ice calved off the Sawyer Glacier in Tracy Arm, Southeast Alaska, United States of America

Glacial iceberg detail from ice calved off the LeConte Glacier near Petersberg, Southeast Alaska, United States of America

Glacial iceberg detail from ice calved off the LeConte Glacier near Petersberg, Southeast Alaska, United States of America

Glacial iceberg detail from ice calved off the LeConte Glacier near Petersberg, Southeast Alaska, United States of America

Glacial iceberg detail from ice calved off the LeConte Glacier near Petersberg, Southeast Alaska, United States of America

Glacial iceberg detail from ice calved off the LeConte Glacier near Petersberg, Southeast Alaska, United States of America

Glacial iceberg detail from ice calved off the Sawyer Glacier in Tracy Arm, Southeast Alaska, United States of America

Glacial iceberg detail from ice calved off the LeConte Glacier near Petersberg, Southeast Alaska, United States of America

African forest elephant (Loxodonta cyclotis), Dzanga Bai, Dzanga Sangha National Park, UNESCO, Central African Republic

Adult humpback whales (Megaptera novaeangliae) co-operatively bubble-net feeding in Southeast Alaska, United States of America

Adult humpback whales (Megaptera novaeangliae) co-operatively bubble-net feeding in Southeast Alaska, United States of America

Adult humpback whales (Megaptera novaeangliae) co-operatively bubble-net feeding in Southeast Alaska, United States of America

Adult humpback whales (Megaptera novaeangliae) co-operatively bubble-net feeding in Southeast Alaska, United States of America

Adult brown bear (Ursus arctos) skeletal remains on Chichagof Island, Alaska, United States of America

Adult brown bear (Ursus arctos) feeding on salmon at Iyoukeen Cove on Chichagof Island, Alaska, United States of America

Adult Svalbard reindeer (Rangifer tarandus platyrhynchus) grazing within the town limits of Longyearbyen, Svalbard, Norway

CERN, Wandering the Immeasurable, steel structure, Globe of Science and Innovation in background, Geneva, Switzerland

Old water tank perched on a cliff overlooking the T-Bar Ranch Homestead in the Coconino National Forest of Arizona, United States of America

Adult polar bear (Ursus maritimus) in Holmabukta on the northwest coast of Spitsberge, Svalbard Archipelago, Norway

Continental drift between North American and Eurasian tectonic plates, Thingvellir National Park, UNESCO, in winter, Western Region, Iceland

People and continental drift of North American and Eurasian tectonic plates, Thingvellir National Park in winter, UNESCO, Western Region, Iceland

St. David's Battery, UNESCO, four guns installed 1910 by British to defend deep water channel leading to Royal Navy Dockyard and Hamilton, Bermuda

St. David's Battery, UNESCO, four guns installed 1910 by British to defend deep water channel leading to Royal Navy Dockyard and Hamilton, Bermuda

The remains of the West Pier as seen through the starling murmuration at sunset, Brighton and Hove, East Sussex, England, United Kingdom

Watermelon crop on lands bought or rented by China for Chinese market, Nong Khiaw area, northern Laos

Starling murmuration at sunset, as seen from the Brighton Beach, City of Brighton and Hove, East Sussex, England, United Kingdom

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

Burial Ground for Slaves and Free Blacks up to 1854, containing 180 graves, St. Peter's Churchyard, St. George, Bermuda

Swedish environmental activists protesting outside the Swedish Parliament about the need for immediate action to combat climate change, Stockholm, Sweden, Scandinavia, Europe

Perito Moreno Glacier, UNESCO World Heritage Site, around El Calafate, Santa Cruz province, Patagonia, Argentina, South America

A man cleaning wool for dyeing in the small village of Angkor Ban, Battambang Province, Cambodia, Indochina, Southeast Asia, Asia

Views of the cemetery at the abandoned whaling station in Stromness Bay on South Georgia in the Southern Ocean, Polar Regions

Scenic mountain landscape of Kyrgyzstan with lush Greenery and Snow-Capped Peaks overlooking Kol Ukok Lake, Kyrgyzstan, Central Asia, Asia

Guest from the Lindblad Expeditions ship National Geographic Sea Bird behind a mushroom or toadstool in Southeast Alaska, United States of America, North America

Adult barred mudskipper (Periophthalmus argentitineatus), at night on the Volivoli Resort grounds on Viti Levu, Fiji, South Pacific, Pacific

Macro view of insect on a daisy flower from the trail of Diana's Peak National Park on Saint Helena, South Atlantic Ocean

Hiking trail in the arid gorge canyon landscape of Los Cahorros Monachil, Monachil, Sierra Nevada, Granada, Andalusia, Spain, Europe

Views of the abandoned whaling station in Prince Olav Harbor on South Georgia, Southern Ocean, Polar Regions

Adult striated caracara (Phalcoboenus australis), close-up, on Carcass Island in the Falkland Islands, South Atlantic Ocean, South America

Abstract of terraces in Moray, Sacred Valley, Urubamba Province, Cusco (Cuzco) Region, Peru, South America

Aerial view of Victoria Quays and Sheffield city skyline at dusk, Sheffield, South Yorkshire, England, United Kingdom, Europe

Aerial view of the crater of Volcan de la Corona at sunrise, Haria, Las Palmas, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Bryce Canyon amphitheater at sunset, Bryce Point, Bryce Canyon National Park, Utah, United States of America, North America