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The boundary fence on the east side of Petrified Forest National Park, Arizona, United States of America

An aerial view of the estuary of the Taw and Torridge Rivers, near Bideford and Barnstaple, Devon, England, United Kingdom, Europe

Olive trees and hills behind Granada and wide landscape with the snowy Sierra Nevada behind, Granada, Andalusia, Spain

Woman below sandstone cliffs at Our Habitas AlUla, resort in ancient oasis in desert canyons of the Ashar Valley, Medina Province, Saudi Arabia

Drone aerial view of Kriaritsi project area with abandoned roads in the south of Greece, Sithonia, Chalkidiki, Greece

Rana El Zein, Deputy Director at AFALULA, and White saxaul (Haloxylon persicum), Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

Rana El Zein, Deputy Director at AFALULA, and White saxaul (Haloxylon persicum), Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

People watching Arak tree (Salvadora persica) at the foot of a fault in sandstone wall, Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

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

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), massing in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

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

Southern stingray (Hypanus americanus) over sand in shark and ray alley, Caye Caulker, Mesoamerican Barrier Reef, Belize

West Indian manatee (Trichechus manatus), with snorkelers near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

Green sea turtle (Chelonia mydas), feeding on the sand near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

Green sea turtle (Chelonia mydas), with snorkeler near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

Caribbean land hermit crab (Coenobita clypeatus), Half Moon Caye, UNESCO, Mesoamerican Barrier Reef, Belize

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

A juvenile killer whale (Orcinus orca) encountered off West Craycroft Island in Blackfish Sound, British Columbia, Canada

Gathering of at least two resident pods of killer whales (Orcinus orca) encountered near sunset, Johnstone Strait, British Columbia, Canada

View of road and coastline at Northernmost point of Thassos island at sunset, Thassos, Aegean Sea, Greek Islands, Greece, Europe

Adult black-legged kittiwakes (Rissa tridactyla) resting on ice in the Svalbard Archipelago, Barents Sea, Norway, Arctic, Europe

Adult black-legged kittiwakes (Rissa tridactyla) feeding at the base of a glacier in the Svalbard Archipelago, Norway, Arctic, Europe

Great frigatebird (Fregata minor) taking handouts from a fisherman in Puerto Ayora on Santa Cruz Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

View of Welome sign and signpost on Tristan da Cunha, the most remote inhabited location on Earth, Tristan da Cunha, South Atlantic Ocean

El Teide National Park, UNESCO World Heritage Site, Tenerife, Canary Islands, Spain, Atlantic, Europe

Galapagos white-cheeked pintail (Anas bahamensis galapagensis) feeding near giant tortoise in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Atlantic Puffin (Fratercula arctica), on Skomer Island in July, a nature reserve off the coast of Pembrokeshire, Wales, United Kingdom, Europe

Beautiful hiking path on steep rocky and grassy slopes in the Italian Alps, Colle del Turlo, Vercelli, Piedmont, Italy, Europe

Scene of a fisherman on boat with pelicans in the port town of Puerto Ayora, Santa Cruz Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Racchi village near Chinchero with distant views of Andes mountains, Sacred Valley, Peru, South America

Tourist photographing an endemic Galapagos marine iguana (Amblyrhynchus cristatus) on Espanola Island in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Drone aerial view of Kriaritsi project area with abandoned roads in the south of Greece, Sithonia, Chalkidiki, Greece

Complete rainbow over the calm waters of Inian Pass in southeast Alaska, Pacific Ocean, United States of America, North America

Views of Bjornsundet (Bear Sound), near the island of Spitsbergen in the Svalbard Archipelago, Norway, Arctic, Europe

Spain.solar panels creating renewable energy from the sun, with a cut,out for tio pepe sherry near jerez in andalucia

Adult king penguins (Aptenodytes patagonicus) returning from sea to the nesting colony at Salisbury Plain, South Georgia, Polar Regions

Migrating Pink-Footed geese over-wintering at Holkham, North Norfolk coast, East Anglia, Eastern England

Migrating Pink-Footed geese over-wintering at Holkham, North Norfolk coast, East Anglia, Eastern England

Birdwatchers inside bird hide watch migrating geese over-wintering near Holkham, Norfolk, East Anglia, United Kingdom

Migrating Pink-Footed geese over-wintering at Holkham, North Norfolk coast, East Anglia, Eastern England

Migrating Pink-Footed geese over-wintering on marshland at Holkham, North Norfolk coast, East Anglia, Eastern England

Migrating Pink-Footed geese over-wintering on marshland at Holkham, North Norfolk coast, East Anglia, Eastern England

Migrating Pink-Footed geese over-wintering on marshland at Holkham, North Norfolk coast, East Anglia, Eastern England

Migrating Pink-Footed geese over-wintering near Holkham, North Norfolk coast, East Anglia, Eastern England

Migrating Pink-Footed geese over-wintering at Holkham, North Norfolk coast, East Anglia, Eastern England

Migrating Pink-Footed geese over-wintering on marshland at Holkham, North Norfolk coast, East Anglia, Eastern England

Migrating Pink-Footed geese over-wintering at Holkham, North Norfolk coast, East Anglia, Eastern England

A greenhouse made from waste plastic drinks bottles in the community garden at Mount Pleasant Ecological Park, Porthtowan, Cornwall, UK.

A greenhouse made from waste plastic drinks bottles in the community garden at Mount Pleasant Ecological Park, Porthtowan, Cornwall, UK.

The largest rammed earth building in the UK, a low impact building technique at Mount Pleasant Ecological Park, Porthtowan, Cornwall, UK.

National Geographic / Lindblad Explorer, Isla de Los Estados (Staten Island), Tierra del Fuego, Argentina

National Geographic / Lindblad Explorer, Isla de Los Estados (Staten Island), Tierra del Fuego, Argentina

South American Fur Seal (Arctocephalus australis) Isla de Los Estados (Staten Island), Tierra del Fuego, Argentina

RockHopper Penguins (Eudyptes chrysocome) Isla de Los Estados (Staten Island), an Ecological and Historical Reserve has been off limits to tourism since 1923

San Juan the Salvamento Lighthouse, Isla de Los Estados (Staten Island), Tierra del Fuego, Argentina

San Juan the Salvamento Lighthouse, Isla de Los Estados (Staten Island), Tierra del Fuego, Argentina