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

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

The new elevator of the thermal baths using a wastewater-based system, Saint Gervais, Haute-Savoie, France

Workers washing the dust off solar panels at a 1 MW solar power station run by Tata power on the roof of an electricity company in Delhi, India, to make them more efficient.

Asia's largest solar popwer station, the Gujarat Solar Park, in Gujarat, India. It has an installed capacity of 1000 MW. Here workers wash dust off the panels to increase their efficiency.

Turf roof on eco houses at the Centre for Alternative Technology in Machylleth, Wales, United Kingdom, Europe

A sign on a petrol pump at a supermarket petrol station advising motorists to drive more efficiently

An e-car charges at a public charging station in Duesseldorf, North Rhine-Westphalia, Germany, Europe

Low energy houses in the Vauban district, designed for the EXPO 2010 in Shanghai, Freiburg, Breisgau, Baden-Wuerttemberg, Germany, Europe

Wood pellets for heating packaged in sacks, at the WestPellets company in Titz, North Rhine-Westphalia, Germany, Europe

Futuristic skyscraper with termite mounds for natural ventilation and energy efficiency, AI generated

Futuristically designed chapel, wood passive house, domed structure, Bad Schwalbach-Langenseifen, Hesse, Germany, Europe

Production of wood pellets for heating, at the WestPellets company in Titz, North Rhine-Westphalia, Germany, Europe

Production of wood pellets for heating, at the WestPellets company in Titz, North Rhine-Westphalia, Germany, Europe

Raw wood chips for the manufacture of wood pellets for heating, at the WestPellets company in Titz, North Rhine-Westphalia, Germany, Europe

Low energy houses in the Vauban district, designed for the EXPO 2010 in Shanghai, Freiburg, Breisgau, Baden-Wuerttemberg, Germany, Europe

Engineering students watching professor cleaning photovoltaic panel to demonstrate improvement in efficiency