Today the most common topic of conversation is to how to preserve the environment. The topic of discussion is global warming, pollution and dependency on non-renewable sources of energy. We already have the technology, we need ways to control our dependency on oil, balance the weather and improvise of way of living. The main components contributing towards polluting the environment are the harmful gases from vehicles. They are not only harmful to the environment but also cause serious health problems. At present, the most important topic of concern is to find solution to control the emission of harmful gases.
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