The population of the world tops six billion and is continuing to rise. Over the last century, the quantity of fossil fuel consumed has mounted almost five times faster than the population! As a consequence, the concentration of CO2 in the atmosphere is more than 360 parts per million and escalating.
The more than 600 million motor vehicles in the world account for the predominant use of oil, the world's prevailing fuel. In the alone, there are more vehicles than licensed drivers, traveling over two trillion miles a year and burning 120 billion gallons of gas - resulting in over a billion tons of CO2 emissions per year.
Even though there have been major efforts to reduce vehicle pollutants over the last several decades, the ever increasing number of motor vehicles on roads, which release toxic emissions while they burn thousands of gallons of fuel every second, contribute to at least one third of the country's overall pollution. What is a main problem of Global warming ?
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