The cars which emit no greenhouse gases or creates no pollution...Cell phones and laptops working for a long time with a single cartridge without the necessity of recharging...The sun, the wind or the water from the river used for heating and lighting even in the night or when there is no wind and the river is dry...The energy from the sun, the wind, the rivers and the nuclear reactors is used to run the car engines...Is it possible? In other words, can we use energy in a way that it can be stored, be renewable and respects the environment and does no harm to health? But the energy: what is it? what purpose does it serve? From where does it come? How is it manipulated? What are the benefits? What are the inconveniences? The Canadian Hydrogen Association is a not-for-profit corporation that promotes the production, transportation, storage and application of hydrogen in its myriad applications and encourages the development of industrial hydrogen and hydrogen energy systems and markets for new energy service technologies to improve the environment. The CHA is the voice of the hydrogen community in Canada and is a trusted advisor to both government and industry. The Association Francaise de lHydrogene, founded in 1998, includes institutions, laboratories, companies and specialists working to promote the development and use of this fuel without carbon and without greenhouse gas emission.