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Children's LiteratureTremendous progress was made in automobiles between the 1970's and 1990's. The single most significant engine development was the turbo charger. It increased power. Early models of the BMW had "2002 Turbo" written in mirror image on the front bumper so that cars knew to get out of the way. The two cars that helped to make the turbo known to the ordinary auto customer were the Porsche 911 turbo and the Saab 99 Turbo. By the 1980's it was the standard route to increase power. American auto manufacturers were slow in adopting the turbo. When pollution became a problem, catalytic converters were installed, but they reduce performance and increase fuel consumption. As an alternative to converters, unleaded fuel was introduced. This was helpful, but it contributed to the "Greenhouse Effect." The diesel engine, another alternative, became popular in Europe, but never really caught on in America. Ralph Nader's advocacy caused seat belts, air bags, and other safety devices to become common. Gradually, auto production extended beyond the traditional manufacturing areas of Europe and the United States to include Japan, Korea, India, China and Australia, to name a few. 2002, Mason Crest Publications, Ages 16 to adult.