Crabeater seal (Lobodon carcinophaga) hauled out on ice floe in Neko Harbor near the Antarctic Peninsula, Antarctica, Polar Regions

A myriad of hard and soft corals compete for space on the substrate of the snorkel site known as the Milky Way, Palau, Micronesia, Pacific

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

Underwater view of of the reef system at Half Moon Caye, UNESCO, Mesoamerican Barrier Reef, Belize

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

Male Great frigatebird (Fregata minor) in breeding plumage with red gular pouch, on Genovesa (Tower) Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

A myriad of hard and soft corals, as well as tropical reef fish on the healthy reef near Volivoli Resort on Viti Levu, Fiji, South Pacific, Pacific

Adult chinstrap penguin (Pygoscelis antarctica), carrying rock in its beak at breeding colony at Half Moon Island, Antarctica, Polar Regions

Adult South Georgia Pipit (Anthus antarcticus) feeding at low tide on Prion Island, Bay of Isles, South Georgia, Polar Regions

King penguins (Aptenodytes patagonicus) at breeding and nesting colony at Right Whale Bay, South Georgia, Polar Regions

Irrigation canal, Falaj irrigation system (Falaj Al-Khatmeen), UNESCO, palm grove, Birkat Al Mouz, Al Dakhliya region, Jebel Akhdar foothills, Oman

Aerial view of Punta Allen Sian Ka'an Reserve, Yucatan Peninsula, Mexico. Red lagoon near Boca Paila Bridge. In the language of the Mayan peoples who once inhabited this region, Sian Ka'an means Origin of the Sky. Located on the east coast of the Yucatán peninsula, this biosphere reserve contains tropical forests, mangroves and marshes, as well as a large marine section intersected by a barrier reef. It provides a habitat for a remarkably rich flora and a fauna comprising more than 300 species of birds, as well as a large number of the region's characteristic terrestrial vertebrates, which cohabit in the diverse environment formed by its complex hydrological system. Along its roughly 120 kilometres of coastline, the property covers over 400,000 hectares of land ranging from sea level to only ten m.a.s.l. The property boasts diverse tropical forests, palm savannah, one of the most pristine wetlands in the region, lagoons, extensive mangrove stands, as well as sandy beaches and dunes. The 120,000 hectares of marine area protect a valuable part of the Mesoamerican Barrier Reef and seagrass beds in the shallow bays. The lush green of the forests and the many shades of blue of the lagoons and the Caribbean Sea under a wide sky offer fascinating visual impressions.

Aerial view of Punta Allen Sian Ka'an Reserve, Yucatan Peninsula, Mexico. Red lagoon near Boca Paila Bridge. In the language of the Mayan peoples who once inhabited this region, Sian Ka'an means Origin of the Sky. Located on the east coast of the Yucatán peninsula, this biosphere reserve contains tropical forests, mangroves and marshes, as well as a large marine section intersected by a barrier reef. It provides a habitat for a remarkably rich flora and a fauna comprising more than 300 species of birds, as well as a large number of the region's characteristic terrestrial vertebrates, which cohabit in the diverse environment formed by its complex hydrological system. Along its roughly 120 kilometres of coastline, the property covers over 400,000 hectares of land ranging from sea level to only ten m.a.s.l. The property boasts diverse tropical forests, palm savannah, one of the most pristine wetlands in the region, lagoons, extensive mangrove stands, as well as sandy beaches and dunes. The 120,000 hectares of marine area protect a valuable part of the Mesoamerican Barrier Reef and seagrass beds in the shallow bays. The lush green of the forests and the many shades of blue of the lagoons and the Caribbean Sea under a wide sky offer fascinating visual impressions.

Aerial view of Punta Allen Sian Ka'an Reserve, Yucatan Peninsula, Mexico. Red lagoon near Boca Paila Bridge. In the language of the Mayan peoples who once inhabited this region, Sian Ka'an means Origin of the Sky. Located on the east coast of the Yucatán peninsula, this biosphere reserve contains tropical forests, mangroves and marshes, as well as a large marine section intersected by a barrier reef. It provides a habitat for a remarkably rich flora and a fauna comprising more than 300 species of birds, as well as a large number of the region's characteristic terrestrial vertebrates, which cohabit in the diverse environment formed by its complex hydrological system. Along its roughly 120 kilometres of coastline, the property covers over 400,000 hectares of land ranging from sea level to only ten m.a.s.l. The property boasts diverse tropical forests, palm savannah, one of the most pristine wetlands in the region, lagoons, extensive mangrove stands, as well as sandy beaches and dunes. The 120,000 hectares of marine area protect a valuable part of the Mesoamerican Barrier Reef and seagrass beds in the shallow bays. The lush green of the forests and the many shades of blue of the lagoons and the Caribbean Sea under a wide sky offer fascinating visual impressions.

Aerial view of Punta Allen Sian Ka'an Reserve, Yucatan Peninsula, Mexico. Red lagoon near Boca Paila Bridge. In the language of the Mayan peoples who once inhabited this region, Sian Ka'an means Origin of the Sky. Located on the east coast of the Yucatán peninsula, this biosphere reserve contains tropical forests, mangroves and marshes, as well as a large marine section intersected by a barrier reef. It provides a habitat for a remarkably rich flora and a fauna comprising more than 300 species of birds, as well as a large number of the region's characteristic terrestrial vertebrates, which cohabit in the diverse environment formed by its complex hydrological system. Along its roughly 120 kilometres of coastline, the property covers over 400,000 hectares of land ranging from sea level to only ten m.a.s.l. The property boasts diverse tropical forests, palm savannah, one of the most pristine wetlands in the region, lagoons, extensive mangrove stands, as well as sandy beaches and dunes. The 120,000 hectares of marine area protect a valuable part of the Mesoamerican Barrier Reef and seagrass beds in the shallow bays. The lush green of the forests and the many shades of blue of the lagoons and the Caribbean Sea under a wide sky offer fascinating visual impressions.

Palms and old pier in Punta Allen Sian Ka'an Reserve, Yucatan Peninsula, Mexico. In the language of the Mayan peoples who once inhabited this region, Sian Ka'an means Origin of the Sky. Located on the east coast of the Yucatán peninsula, this biosphere reserve contains tropical forests, mangroves and marshes, as well as a large marine section intersected by a barrier reef. It provides a habitat for a remarkably rich flora and a fauna comprising more than 300 species of birds, as well as a large number of the region's characteristic terrestrial vertebrates, which cohabit in the diverse environment formed by its complex hydrological system. Along its roughly 120 kilometres of coastline, the property covers over 400,000 hectares of land ranging from sea level to only ten m.a.s.l. The property boasts diverse tropical forests, palm savannah, one of the most pristine wetlands in the region, lagoons, extensive mangrove stands, as well as sandy beaches and dunes. The 120,000 hectares of marine area protect a valuable part of the Mesoamerican Barrier Reef and seagrass beds in the shallow bays. The lush green of the forests and the many shades of blue of the lagoons and the Caribbean Sea under a wide sky offer fascinating visual impressions.

Seagulls in the marshland adjacent to the Odiel river. At low tide. Aerial view. Drone shot. Huelva province, Andalusia, Spain, Europe

Network of channels and streams at low tide, in the marshland of the Bahia de Cadiz, aerial view, drone shot, Cadiz province, Andalusia, Spain, Europe

Hiking along the Aletsch Glacier, Konkordia Platz, UNESCO world heritage Jungfrau - Aletsch - Bietschhorn region, Valais, Switzerland

View toward Konkordia Platz, Aletsch glacier, UNESCO world heritage Jungfrau - Aletsch - Bietschhorn region, Valais, Switzerland

View from Mount Eggishorn to the Aletsch Glacier, UNESCO world heritage Jungfrau - Aletsch - Bietschhorn region, Valais, Switzerland

Dry ground on the shore, drought, silting, Jaguari reservoir in Sao Paulo, Brazil, South America

Dry ground on the shore, drought, silting, Jaguari reservoir in Sao Paulo, Brazil, South America

Detail of a photovoltaic system, solar panel, solar cells

Dry ground on the shore, drought, silting, Jaguari reservoir in Sao Paulo, Brazil, South America

Dry ground on the shore, drought, silting, Jaguari reservoir in Sao Paulo, Brazil, South America

The town of San Agustin amidst masses of shimmering plastic greenhouses, on the right the shallow lagoon Salinas de Cerrillos, aerial view, drone shot, Almeria province, Andalusia, Spain, Europe

Biosphere 2, self-sustaining ecosystem, lodgings of mission's scientists, Oracle, Arizona, USA, North America

Solar panels with the reflection of a tree, illustration, symbolic image

Aerial view, Heart Reef, Great Barrier Reef, UNESCO World Heritage Site, Queensland, Australia, Oceania

Renewable wind and solar energy. Wind turbine next to photovoltaic system on hill

Self-sufficient labor-intensive farming in Ha Giang province, Vietnam.Traditional sustainable agriculture

Mother and son climbing some stairs along a path in the Garajonay natural park on La Gomera, Canary Islands

Fisherman on boat in Trang An, a scenic area near Ninh Binh, Vietnam inscribed as a UNESCO World Heritage Site in 2014

Fisherman on boat in Trang An, a scenic area near Ninh Binh, Vietnam inscribed as a UNESCO World Heritage Site in 2014

Ffishing nets fixed on Bamboo poles near Danang, Vietnam

Self-sufficient labor-intensive farming in Ha Giang province, Vietnam.Traditional sustainable agriculture

Biosphere 2, self-sustaining ecosystem, Oracle, Arizona, USA, North America

Mother and son trekking up some stairs on a path in the Garajonay natural park on La Gomera, Canary Islands

Network of dry channels and streams at low tide, in the marshland of the Bahia de Cadiz, aerial view, drone shot, Cadiz province, Andalusia, Spain, Europe

Network of channels and streams at low tide, in the marshland of the Bahia de Cadiz, aerial view, drone shot, Cadiz province, Andalusia, Spain, Europe

Network of dry channels and streams at low tide, in the marshland of the Bahia de Cadiz, aerial view, drone shot, Cadiz province, Andalusia, Spain, Europe

Renewable Energy concept with USB power cord with natural leaves

Network of dry channels and streams at low tide, in the marshland of the Bahia de Cadiz, aerial view, drone shot, Cadiz province, Andalusia, Spain, Europe

Network of dry channels and streams at low tide, in the marshland of the Bahia de Cadiz, aerial view, drone shot, Cadiz province, Andalusia, Spain, Europe

Biosphere 2, self-sustaining ecosystem, Oracle, Arizona, USA, North America

Trang An, a scenic area near Ninh Binh, Vietnam inscribed as a UNESCO World Heritage Site in 2014

Mother and son trekking on some stairs along a path in the Garajonay natural park on La Gomera, Canary Islands

Aerial view of the Great Barrier Reef, UNESCO World Heritage Site, Queensland, Australia, Oceania

Biosphere 2, self-sustaining ecosystem, cactus in front of facility with tropical rainforest, Oracle, Arizona, USA, North America

Beautiful footpath in the natural park of Garajonay in La Gomera, Canary Islands

A boy and a mother playing on the wooden horse in the leisure area at Laguna Grande in the Garajonay natural park on La Gomera, Canary Islands

The Stikelkamp Forest Ecosystem at Gut Stikelkamp, Leer County, East Frisia, Germany, Europe

Biosphere 2, self-sustaining ecosystem, Oracle, Arizona, USA, North America

Aerial view of the Great Barrier Reef, UNESCO World Heritage Site, Queensland, Australia, Oceania

A boy and a mother playing on the wooden horse in the leisure area at Laguna Grande in the Garajonay natural park on La Gomera, Canary Islands

Cloudy Sky and Electricity Pylon, Germany, Munich, Bavaria