Today there are over a billion vehicles in the world, and within twenty years, the number will double, largely a consequence of China's and India's explosive growth. Given that greenhouse gases are already creating havoc with our climate and that violent conflict in unstable oil-rich nations is...

At present, there are roughly a billion cars in the world. Yet within twenty years, the number will double to 2 billion, largely a consequence of China's and India's explosive growth. Given that greenhouse gases are already creating havoc with our climate and that violent conflict in unstable...