Array of solar panels on a bright sunny day, Sierra Alhamilla, near Nijar, Almeria, Andalusia, Spain, Europe

The Global Seed Vault just outside the town of Longyearbyen on the island of Spitsbergen in Svalbard, Norway, Arctic, Europe

Mallard ducklings just a few days old, Swinbrook, Oxfordshire, England

Wind power plant, in Casares, Malaga, Spain

Wind power plant, in Casares, Malaga, Spain

New house with solar panels, Franconia, Bavaria, Germany, Europe

Aerial picture, roof with solar panels, rotunda, Alt-Oer retirement home, Oer-Erkenschwick, Ruhr Area, North Rhine-Westphalia, Germany, Europe

Aerial picture, roof with solar panels, rotunda, Alt-Oer retirement home, Oer-Erkenschwick, Ruhr Area, North Rhine-Westphalia, Germany, Europe

Geothermal power plant, Latrabjarg, Iceland, Europe

Solar-tree in the Ulmer residential area solar city, Ulm, Baden-Wuerttemberg, Germany

Solar Village with solar roofs, Freiburg, Baden-Wuerttemberg, Germany, Europe

Farm with a solar installation on the roof, Black Forest, Baden-Wuerttemberg, Germany, Europe

Solar Village with solar roofs, Freiburg, Baden-Wuerttemberg, Germany, Europe

Solar panels on the roof of a house with patches of snow, renewable energy

Solar district heating plant, Nordby, Samsoe, Denmark, Europe

Mother and daughter laughing on sofa