Zero tolerance - The Engineer: "Cars have no substitute — they cannot be replaced by public transportation because people need and want their autonomy. Buying a car is still a major life event and owning one is an important symbol of freedom, status, and achievement.
But what kind of cars will they be — diesels, flex fuels, hybrids, fuel cells, electric? This question is of growing importance as the world is changing rapidly.
Two trends are bringing this discussion to the forefront. The first is the shift in demographics. Today, the world's population is 6.7 billion. By 2050, it is expected to reach more than 9 billion. Today, there are 600 million vehicles worldwide. By 2050, statistics show there may be up to 2.5 billion vehicles. Many of those will be sold to the rising middle classes in markets such as China and India where, today, there are fewer than 50 vehicles per 1,000 inhabitants compared with 800 vehicles per 1,000 in the US."
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