Hand holding smartphone with black screen in front of blue sky, cut out

Hand holding paper airplane against blue sky

"Wind turbine against blue sky, Rhena, Mecklenburg-Vorpommern, Germany, Europe"

"Recently built wind turbine against a blue sky, Grevenbroich, North Rhine-Westphalia, Germany, Europe"

"Wind turbines against blue sky, Rhena, Mecklenburg-Vorpommern, Germany, Europe"

"Hand holding an organ donor card, fake name, against a blue sky with some clouds, symbolic image for bearer of hope, organ donation"

Male hand holding pinwheel

Wind wheel and a wind turbine against a blue sky, Black Forest, Baden-Wuerttemberg, Germany, Europe

Young woman, about 25 years, wearing a bright jacket, a cap, dark sunglasses and a red scarf, against a blue sky, holding a ski stick, smiling, Thuringian Forest mountains, Thuringia, Germany, Europe

Young woman, about 25 years, wearing a bright cap, dark sunglasses and a red scarf, against a blue sky, holding ski sticks, smiling, Thuringian Forest mountains, Thuringia, Germany, Europe

Young woman, about 25 years, wearing a red and white ski suit and a light grey cap, against a blue sky, one hand next to her ski glasses, Thuringian Forest mountains, Thuringia, Germany, Europe

Young woman, about 25 years, wearing a cap, dark sunglasses and a red scarf, against a blue sky, holding a ski stick, smiling, Thuringian Forest mountains, Thuringia, Germany, Europe

Silhouette of a woman against the sunset sky, her hands enclosing the setting sun, Lefkas, Greece, Europe

A hand holding a wind turbine, environmentally friendly factory, and a compact fluorescent light bulb

A women's hand holding a frangipani and an opened book (composite)

Woman flying on a credit card

Maintenance engineer with tools and power plant in background

Illustration of a young couple holding hands standing in the snow

Illustration of four people holding hands skipping down a path

Brunette with summer shorts and halter top with drink in her hand

The building blocks of ecology

illustration of a family with photos

illustration of smart eco city

illustration of a family

illustration of kids flying in the air

Woman's hand holding a wind turbine against a blue sky