Indian woman villagers patting cow dung mound for cooking fuel at Kutalpura Village in Rajasthan, Northern India

Indian woman villagers patting cow dung mound for cooking fuel at Kutalpura Village in Rajasthan, Northern India

Indian woman villagers drying cow dung for cooking fuel at Kutalpura Village in Rajasthan, Northern India

Advice on a filling station for Bio Ethanol E 85

Car driving past a rape field, symbolic picture for bio fuel

Charging station for the electrical cars of a rental car company in a public garage in Dusseldorf, North Rhine-Westphalia, Germany, Europe

Charging station for the electrical cars of a rental car company in a public garage in Dusseldorf, North Rhine-Westphalia, Germany, Europe

Charging station for electrical cars of a rental car company in a public garage in Dusseldorf, North Rhine-Westphalia, Germany, Europe

Hydrogen fuel cell vehicle, Mercedes B-class zero-emission, electric motor, Berlin, Germany, Europe

Hydrogen fuel cell vehicle, Mercedes B-class zero-emission, Berlin, Germany, Europe

Hydrogen fuel cell vehicle, Mercedes B-class zero-emission, electric motor, Berlin, Germany, Europe

Hydrogen fuel cell vehicle, Mercedes B-class zero-emission, Berlin, Germany, Europe