Hydrogen is the lightest element on the periodic table, with an atomic weight of 1.008. This means that hydrogen readily dissipates into the surrounding atmosphere, making it difficult to ignite if it is not confined. However, hydrogen is an energy carrier that is indeed – as is the case with many other fuels – highly combustible when concentrated and in the presence of oxygen. Risk assessments show however, that it is no more dangerous than other fossil fuels or natural gas. When using hydrogen it is important to be in a well-ventilated area to limit the potential for hydrogen accumulation. Hydrogen fuel can be used safely for transportation, in homes, in commercial buildings and for efficiency and conservation efforts and has been safely in use for over 100 years.