Captive Galapagos giant tortoise (Geochelone elephantopus) at the Charles Darwin Research Station, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Captive Galapagos giant tortoise (Geochelone elephantopus) at the Charles Darwin Research Station, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Captive Galapagos giant tortoise (Geochelone elephantopus) at the Charles Darwin Research Station, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Captive Galapagos giant tortoise (Geochelone elephantopus) at the Charles Darwin Research Station, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Young Captive Galapagos giant tortoise (Geochelone elephantopus) being fed, San Cristobal Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Galapagos penguin (Spheniscus mendiculus) feeding underwater on small baitfish in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Hans Egede Statue, Nuuk, capital of Greenland, Denmark, Polar Regions

Walk around the Dana village, Dana Biosphere Reserve, Jordan, Middle East

Polar bear warning sign, Grise Fjord, most northern community in America, Nunavut, Canadian Arctic, Canada, North America

King penguin (Aptenodytes patagonicus) adult and chick at breeding and nesting colony at Salisbury Plain, South Georgia, Polar Regions

Detail of Cape mountain zebra (Equus zebra) stripes, Mountain Zebra National Park, Eastern Cape, South Africa, Africa

Gentoo penguin (Pygoscelis papua) adult feeding chick at Hannah Point on Livingston Island, Antarctica, Southern Ocean, Polar Regions

Tree nursery in Kpalime, Togo, West Africa, Africa

Juvenile alligator, Gator Country Wildlife Adventure Park, Beaumont, Texas, United States of America

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

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

Aerial of Pia glacier, Tierra del Fuego, Chile, South America

Lava lizard (Microlophus spp) courtship behavior in the Galapagos Islands Archipelago, UNESCO World Heritage Site, Ecuador, South America

Galapagos fur seal (Arctocephalus galapagoensis) hauled out on lava flow in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Male Great frigatebird (Fregata minor) in breeding plumage with red gular pouch, on North Seymour Island, Galapagos Islands, UNESCO World Heritage Site, Ecaudor, South America

Guest from the Lindblad Expeditions ship National Geographic Sea Bird on path beside a skull in Southeast Alaska, United States of America, North America

View of the skeletal ruins of the A-Bomb Dome, Hypocenter, Hiroshima Peace Memorial, UNESCO, Hiroshima, Honshu, Japan

Guide and Ranger team of the Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

Sea star stranded by the low tide in Jackson Pass Provincial Marine Park, British Columbia, Canada, North America

Adult bull southern elephant seal (Mirounga leonina), skull on display at the Natural History Museum in Stanley, Falklands, South America

Macaroni penguins (Eudyptes chrysolophus) scrambling up steep cliffs at Hercules Bay on South Georgia Island, Polar Regions

Bay of Bones Museum, Ohrid, Macedonia, Europe

Tourist holding a green sea turtle (Chelonia mydas) hatchling at night on Long Beach on Ascension Island, South Atlantic Ocean

Green sea turtle (Chelonia mydas) eggs uncovered from another female laying eggs the previous night, Ascension Island, South Atlantic Ocean

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

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

Captive Galapagos giant tortoise (Geochelone elephantopus) at the Charles Darwin Research Station, 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

Blue-footed booby (Sula nebouxii) newly hatched chick in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Trash in sewer in Amlame, Togo, West Africa, Africa

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

Blue-footed booby (Sula nebouxii) courtship behavior in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Environmental song, Dimma Camp, Ethiopia, Africa

India. Girls working in vegetable plot. Mary matha bala bhavan, a girls orphanage run by syro-malabar catholic missionary sisters of mary immaculate (msmi), chamal village, thamarassery diocese, khozikode, kerala. 2007

Solar panels on a building at the Centre for Alternative Technology in Machylleth, Wales, United Kingdom, Europe

Rubbish thrown out by an average household in one year at the Centre for Alternative Technology in Machylleth, Wales, United Kingdom, Europe

Leaflets about climate change, Cumbria, England, United Kingdom, Europe

Education trip for local Azorean Children part-funded by WDCS. Azores

Crab preying on dead portuguese man-of-war, Physalia physalis, Praia do Forte, Bahia, Brazil (South Atlantic)

Human hand holding compact fluorescent light bulb

The Petrel and the Guillamont, two pulling boats, part of the Chewonki Foundation's fleet, head out of Wiscasset on an orientation trip for Bodwin College freshmen. The boats sail down the Back River. This non-profit Foundation, formerly a boys camp where Roger Tory Peterson directed the nature program in the 1920's, provides environmental programs throughout the year for a diverse number of groups throughout Maine and offers participation in residential and non-residential programs in environmental education.

Port Isobel, VA, This former hunting lodge is now a Chesapeake Bay Foundation educational center

Research divers from the MOC Marine Institute glue broken coral heads back together and map out coral damage at Molokini Marine Preserve off the island of Maui, Hawaii. In the future, data from here will help to determine the health of Hawaii's reefs, Maui, Hawaii, United States of America

Research divers from the MOC Marine Institute map out coral damage at Molokini Marine Preserve off the island of Maui, Hawaii. In the future, data from here will help to determine the health of Hawaii's reefs, Maui, Hawaii, United States of America

Fort Whyte Centre for Environmental Education with a hot air balloon in background, Winnipeg, Manitoba

GHANA West Education Teacher and children in primary school studying environmental issues.

Portrait of schoolgirl ( 6-7) presenting environmental knowledge