Lifestyle changes driven predominantly by higher incomes—particularly increased auto mobility have consistently led to higher carbon emissions, and the trends in the travel sector show no signs of saturation.” The World Business Council for Sustainable Development (WBCSD, 2004) expects that the number of light duty vehicles on the roads will steadily increase from the 2004-level of 750 million to 1 billion around 2020 and up to 2 billion around 2050