Gary Bell/ Oceanwide / Surfer, Solitary Islands Marine Park, New South Wales, Australia

Yva Momatiuk & John Eastcott / Ice climbers atop Skaftafellsjokull Glacier, Skaftafell National Park, Iceland

Yva Momatiuk & John Eastcott / Ice climber scaling Skaftafellsjokull Glacier, Skaftafell National Park, Iceland

Yva Momatiuk & John Eastcott / Tourist next to cascades, Dynjandi Waterfall, Westfjords, Iceland

Jeff Foott / The Citadel Ruins, Cedar Mesa area, Bears Ears National Monument, Utah

Colin Monteath / Climber near Pioneer Hut with Douglas Peak and Fox Glacier, Westland Tai Poutini National Park, New Zealand

Enrique Lopez-Tapia / Trango towers in fog, the world's tallest cliffs, Baltoro Glacier, Baltistan, part of the Gilgit-Baltistan territory, northern Pakistan. July 2007.

Pete Oxford / Buttress root in rainforest with photographer Pete Oxford standing beneath it, Sacha Lodge, Amazon Rain Forest, Ecuador

Suzi Eszterhas / Hot air balloon flying over wildebeest herd, Masai Mara Triangle, Kenya

Colin Monteath / Hiker looking at Mt Cook, known locally as Aoraki, from Malte-Brun, Southern Alps, New Zealand

Colin Monteath / Mt Sefton, climber at dawn above Mueller hut and cloud-filled Mueller Glacier, Mt Cook National Park, New Zealand

Bob Barbour / Surfer known as 'Wingnut, ' Costa Rica

Colin Monteath / Mountaineer enjoying the view of Mt Everest and the Himalayan Mountains at sunset from Gokyo Ri, Khumbu, Nepal

Pete Oxford / Chagras or cowboys on an overnight ride at a hacienda during the annual cattle round-up, with Mt Antisana in the background, Ecuador

Pete Oxford / Chagra cowboys herding cattle and burning the hillsides to keep cattle on the move and rejuvenate the pasture at a hacienda during the annual overnight cattle round-up, Andes Mountains, Ecuador

Konrad Wothe / Tourists on Russian icebreaker breaking through pack ice, Antarctica

Konrad Wothe / Cardon (Pachycereus pringlei) cactus photographed by tourist, largest cacti in the world and may live over 200 years, Sonoran Desert, Baja California, Mexico

Matthias Breiter / Two climbers at Ruth Glacier, with Mt McKinley towering above them, Denali National Park and Preserve, Alaska

Tui De Roy / Galapagos Sea Lion (Zalophus wollebaeki) group photographed by tourists, Gardner Bay, Hood Island, Galapagos Islands, Ecuador

Michio Hoshino / Illuminated tent beneath snow-covered mountains and Aurora borealis, Alaska

Norbert Wu / Snorkeler Deanna Mah at The Baths, British Virgin Islands

Jim Brandenburg / Farm house and tree-lined road in winter, Minnesota

Nick Upton / Felled conifer trees stacked beside forestry track through mixed forest. Near Muraka Forest Reserve, a rare surviving home for Siberian flying squirrel (Pteromys volans). Near Lisaku, Estonia. April 2...

Nick Upton / Felled trees stacked beside forestry track through mixed forest. A few metres outside protected limits of Muraka Forest Reserve, a remaining habitat of Siberian flying squirrel (Pteromys volans). Esto...

Nick Upton / Felled conifers stacked at edge of forest.Near Muraka Forest Reserve, a rare surviving home for the Siberian flying squirrel (Pteromys volans). Estonia. April 2018.

Nick Upton / Felled Aspen (Populus tremula) trees with tit nests in hollows. Treeholes suitable for Siberan flying squirrel (Pteromys volans). Near Lisaku, Estonia. April 2018.

Chase Dekker / Hiker near waterfall and basalt columns, Svartifoss Waterfall, Skaftafell National Park, Iceland

Chase Dekker / Hiker at waterfall, Kirkjufellsfoss, Snaefellsnes Peninsula, Iceland

Chase Dekker / Hiker at coastline, Garrapata State Beach, California

Chase Dekker / Huts and peak, Matterhorn, Findeln, Switzerland

Chase Dekker / Hiker at Delicate Arch in winter, Arches National Park, Utah

Nick Garbutt / Aerial view of deforestation and mid-altitude rainforest near Andasibe-Mantadia National Park, eastern Madagascar. October 2017.

Ashley Cooper / Pile of bones, the remains of hunted Beluga Whales (Delphinapterus leucas) at Bourbonhamna Svalbard, Norway, July 2013

Ashley Cooper / Pile of bones, the remains of hunted Beluga Whales (Delphinapterus leucas) at Bourbonhamna Svalbard, Norway, July 2013

Ashley Cooper / Pile of bones, the remains of hunted Beluga Whales (Delphinapterus leucas) at Bourbonhamna Svalbard, Norway, July 2013

Ashley Cooper / Old house at Recherchefjorden, Van Keulenfjorden, Spitsbergen, Svalbard. It is gradually sliding down slope due to solifluction and permafrost melt. Norway, July 2013.

Ashley Cooper / Old house at Recherchefjorden, Van Keulenfjorden, Spitsbergen, Svalbard. It is gradually sliding down slope due to solifluction and permafrost melt. Norway, July 2013.

Shane P. White / Himeji Castle, Japan

Shane P. White / Moai statues, Ahu Tongariki, Easter Island, Chile

Shane P. White / Moai statue, Ahu Tongariki, Easter Island, Chile

Shane P. White / Moai statues, Ahu Tongariki, Easter Island, Chile

Shane P. White / Moai statue, Ahu Tongariki, Easter Island, Chile

Heike Odermatt / Tourists on Svinafellsjokull Glacier, Skaftafell National Park, Iceland

Yva Momatiuk & John Eastcott / Old church and cemetary, Grafarkirkja, Iceland

Yva Momatiuk & John Eastcott / Old church, Grafarkirkja, Iceland

Yva Momatiuk & John Eastcott / Ice climbers on Skaftafellsjokull Glacier, Skaftafell National Park, Iceland

Jeff Foott / Ancestral Puebloan ruins, Road Canyon, Bears Ears National Monument, Utah

Jeff Foott / Ancestral Puebloan ruins, Road Canyon, Bears Ears National Monument, Utah

Agustin Esmoris / Moai statue, Rano Raraku, Easter Island, Chile

Agustin Esmoris / Moai statue, Rano Raraku, Easter Island, Chile

Ingo Arndt / Lavaka or erosion scars. Human deforestation has caused hillside erosion, Madagascar December 2013.

Jeff Foott / River House Ruin, Butler Wash, Bears Ears National Monument, Utah

Jeff Foott / Moon House ruins, Grand Gulch, Bears Ears National Monument, Utah

Jeff Foott / Moon House ruins, Grand Gulch, Bears Ears National Monument, Utah

Jeff Foott / Moon House ruins, Grand Gulch, Bears Ears National Monument, Utah

Jeff Foott / Doll House Ruin, Cedar Mesa, Bears Ears National Monument, Utah

Jeff Foott / Doll House Ruin, Cedar Mesa, Bears Ears National Monument, Utah

Jeff Foott / House on Fire Ruin, Mule Canyon, Bears Ears National Monument, Utah

Jeff Foott / Honeycomb Ruin, Cedar Mesa, Bears Ears National Monument, Utah

Jeff Foott / Honeycomb Ruin, Cedar Mesa, Bears Ears National Monument, Utah

Jeff Foott / Honeycomb Ruin, Cedar Mesa, Bears Ears National Monument, Utah

Jeff Foott / Caprock Ruin, Cedar Mesa, Bears Ears National Monument, Utah

Jeff Foott / Caprock Ruin, Cedar Mesa, Bears Ears National Monument, Utah

Jeff Foott / Caprock Ruin at sunset, Cedar Mesa, Bears Ears National Monument, Utah

Jeff Foott / Caprock Ruin at sunset, Cedar Mesa, Bears Ears National Monument, Utah

Jeff Foott / Fallen Roof granaries ruin, Bears Ears National Monument, Utah

Jami Tarris / Tourists and glacier, Spitsbergen, Svalbard, Norway

Jami Tarris / Tourists and glacier, Spitsbergen, Svalbard, Norway

Cyril Ruoso / Floating houses with nets to farm fish, Ha Long Bay, Cat Ba Island, Vietnam

David Pattyn / Mangrove creeks along the Marakissa River. These mangroves have been seriously degraded by human influence. Gambia, Africa, May.

David Pattyn / Mangrove creeks along the Marakissa River. These mangroves have been seriously degraded by human influence. Gambia, Africa, May.

Sebastian Kennerknecht / Snow Leopard (Panthera uncia) biologist, David Cooper, walking in mountains, Sarychat-Ertash Strict Nature Reserve, Tien Shan Mountains, eastern Kyrgyzstan

Sebastian Kennerknecht / Snow Leopard (Panthera uncia) biologist, David Cooper, walking in mountains, Sarychat-Ertash Strict Nature Reserve, Tien Shan Mountains, eastern Kyrgyzstan

Sebastian Kennerknecht / Snow Leopard (Panthera uncia) biologist, Shannon Kachel, in mountains, Sarychat-Ertash Strict Nature Reserve, Tien Shan Mountains, eastern Kyrgyzstan

Sebastian Kennerknecht / Snow Leopard (Panthera uncia) biologist, Shannon Kachel, walking in mountains, Sarychat-Ertash Strict Nature Reserve, Tien Shan Mountains, eastern Kyrgyzstan

Tim Laman / Mount Hagen and lower slopes with human habitation and disturbance, Papua New Guinea. December 2010.

Michael Durham / Tipi frames under the Milky Way from a Nez Perce encampment, Big Hole National Battlefield, Montana

Michael Durham / Teepee frames under the Milky Way from a Nez Perce encampment, Big Hole National Battlefield, Montana

Cyril Ruoso / Human skull exposed where a pre-Inca burial site has been pillaged, Poroma Valley, Peru 2013

Norbert Wu / Dune buggy on sand dunes near Barstow, Dumont Dunes Off-Highway Vehicle Area, California

Norbert Wu / Dune buggy on sand dunes near Barstow, Dumont Dunes Off-Highway Vehicle Area, California

Pete Oxford / Cyclist near snow-covered peak, Cotopaxi Volcano, Cotopaxi National Park, Andes, Ecuador

Pete Oxford / Cyclist near snow-covered peak, Cotopaxi Volcano, Cotopaxi National Park, Andes, Ecuador

Norbert Wu / Mangrove (Rhizophora sp) forest with underground river surfacing near coast, Yucatan Peninsula, Mexico

Norbert Wu / Mangrove (Rhizophora sp) forest with underground river surfacing near coast, Yucatan Peninsula, Mexico

Sebastian Kennerknecht / Agricultural fields and suburban developments, Santa Clara Valley, California

Sebastian Kennerknecht / Urban sprawl encroaching on oak savanna, Bay Area, California

Pete Oxford / Stilt house in river west of Georgetown, West Demerara Conservancy, Guyana

Pete Oxford / Essequibo River and Wai-wai settlement, Guyana

Matthias Breiter / Tourists and icebergs, Ilulissat, Greenland

Ingo Arndt / Buildings on artificial islands, Marco Island, Florida

Ingo Arndt / Buildings on artificial islands, Marco Island, Florida

Ingo Arndt / Buildings on artificial islands and canals, Marco Island, Florida

Anup Shah / Southern plains grey langur / Hanuman langur (Semnopithecus dussumieri) in stand off with domestic dogs. Jodhpur, Rajasthan, India. March.

Michael Quinton / Aurora borealis over house, Alaska

Michael Quinton / Aurora borealis over house, Alaska