An Overview of H₂ Fuel for Use in the Transportation Sector

The steady rise in atmospheric CO₂ levels (Figure 1) has been identified as the major cause of global average temperature rise, which has occurred since the start of the industrial revolution early in the nineteenth century and has accelerated in the last 50 years. The world population growth in the last 50 years has been from about 2.6 to 6.2 billion, mostly in the less developed countries (Figure 2). All these people naturally aspire to a more prosperous lifestyle and this inevitably leads to more pollution and more rapid consumption of fossil fuels and emission of greenhouse gases, principally CO₂.