Heliostats at the solar energy scientific research centre, Tabernas, Almeria, Andalusia, Spain, Europe

Heliostats reflect sunrays to receiver tower, solar energy scientific research centre, AORA Tulip System, Tabernas, Almeria, Andalusia, Spain, Europe

Energy efficient CIEMAT building research at Solar energy research establishment near Tabernas, Almeria, Andalusia, Spain, Europe

A woman smiling as she turns on the new solar light in her mud hut, Tanzania, East Africa, Africa

A group of boys read their homework by the light of a solar lantern, Tanzania, East Africa, Africa

A group of boys read their homework by the light of a solar lantern, Tanzania, East Africa, Africa

A light-filled elementary classroom. A white ceiling reflects light from the windows above. Traditional building methods and materials, such as the poplar and willow ceilings are combined with modern solar and passive solar technology. Druk Padma Karpo Institute. Shey, Ladakh, India

In mid January 2015, a three day period of excessive rain brought unprecedented floods to the small poor African country of Malawi. It displaced nearly quarter of a million people, devastated 64,000 hectares of land, and killed several hundred people. This shot shows solar powered lamps in a refugee camp near Chikwawa.

Solar panels on the Mono Lake visitor centre in Lee Vining, California, USA.

A light-filled elementary classroom. A white ceiling reflects light from the windows above. Traditional building methods and materials, such as the poplar and willow ceilings are combined with modern solar and passive solar technology. Druk Padma Karpo Institute. Shey, Ladakh, India

A light-filled elementary classroom. A white ceiling reflects light from the windows above. Traditional building methods and materials, such as the poplar and willow ceilings are combined with modern solar and passive solar technology. Druk Padma Karpo Institute. Shey, Ladakh, India

Solar lights in a garden in Quorn, Leicestershire, England, United Kingdom, Europe

Solar lighting at a tar sands mine, Fort McMurray, Alberta, Canada, North America

Photovoltaic solar tracker at a solar farm near Antissa, Lesbos (Lesvos), Greece. MORE INFO: Solar trackers automatically rotate and tilt photovoltaic panels to follow the sun throught the day, maximising sunlight absorpton rates. Several of these Solar farms have been built on Lesbos since 2010.

Solar farm with four Photovoltaic solar trackers, near Antissa, Lesbos (Lesvos), Greece. MORE INFO: Solar trackers automatically rotate and tilt photovoltaic panels to follow the sun throught the day, maximising sunlight absorpton rates. Several of these Solar farms have been built on Lesbos since 2010.

A solar powered street lamp in Victoria, Australia, Pacific

Solar power, concentrating the sun's power through a magnfying glass

Sunset reflecting in the sea

Sun with Quiet Corona

Jack-o'-lantern Sun

Aurora Australis over Concordia base, Antarctica

Kitt Peak

Vibrant solar panels at sunrise at a modern solar farm

Large commercial solar panel on a bright clear day

Aerial looking over a modern solar farm at sunrise in the English countryside panoramic

Aerial view looking down onto commercial solar panels at sunrise in the English countryside

Detail of a photovoltaic system, solar panel, solar cells

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

Planet earth

A green lamp and solar panels on a pole, navigation light, aids to navigation, Mi&dzyzdroje beach resort, Misdroy, Wolin Island, Baltic Sea, West Pomeranian Voivodeship, Poland, Europe

Solar-powered street lamp, photo-voltaic system, Herbolzheim, Baden-Wuerttemberg, Germany, Europe

Aurora Borealis (Northern Lights) in Oulu, Finland during the peak of a solar storm.

Aurora Borealis (Northern Lights) in Oulu, Finland during the peak of a solar storm.

Aurora Borealis (Northern Lights) in Oulu, Finland during the peak of a solar storm.

Manhattan Skyline At Sunset, Liberty State Park, Jersey City, New Jersey, United States Of America

Milky Way As Seen From Saddle Road, Hawaii, United States Of America

A young girl beside a large solar panel in a farmhouse garden.