Argument: Hydrogen is flammable and dangerous
- Debate: Hydrogen vehicles - con argument.
Patrick J Coyle. "The Hydrogen Debate Continues". Suite 101. 9 Jul. 2007 - "Hydrogen is a light, very flammable gas. It burns at a much wider range of concentrations in the atmosphere than propane (Wald), and requires less energy to ignite. This means that hydrogen is much more likely to catch fire than are hydrocarbon fuels currently in use."