Sustainability of energy sources: the case for hydrogen

All the main indicators of state oh health of our Planet’s natural systems show clear worsening elements and, since a great part of environment dangerous emissions is connected with different stages of energy cycle, it is manifest that the energetic political has an essential role to sustainable environment. Energetic field is in a period of transition when renewable energetic sources will have a very important roll but the hydrogen, most plentiful and light element in the Universe, could represent the principal fuel for the XXI century’s economy. Hydrogen’s Era is becoming a reality, with many benefits for pollution, but also with market and technological uncertainties and difficulties.