Lincoln

Earth Day, observed on April 22, is a global annual celebration of the environmental movement. The day and its activities date back to 1970.The environmental push over the past four decades hasn't skipped big business, which have contributed to concrete advances in new forms of energy, among them wind and solar. Companies have also introduced many new products that run on advanced engine power — power that gives off few if any emissions, especially compared to older, related products that run on fossil fuels.Near the top of the list of products that are using energy more efficiently or using alternative energy are cars. While motor vehicle sales are an important part of the economy, their engines have long contributed to air pollution. Close to 15 million cars and light trucks will be sold this year alone in the U.S. And still the great majority of these continue to be powered by gasoline.The reasons that people are interested in "green cars" go beyond environmental advantages. Gas pri...

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