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Ray bus is like most buses, …

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Ray bus is like most buses, powered by a petrol engine. These buses contribite ro enviormentally pollition Some cities have a trolley buses: they are powered by electric engine .the by voltage needed for electric engine is provided by overhead lines(like electric trains) The electricity supply by a power station using fossil fuel . Supporter for the use of trolley buses in a city say that thease buses don 't contribute to enviormental pollution Are these supporters right? Explain your answer?
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