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Alternative fuels are substantially non-petroleum.
They yield both energy security and environmental benefits. The invention of petrol-run or gasoline engines has undoubtedly revolutionized our lives but, as time has shown, the changes it has wrought have not always been positive. Research has shown that using petroleum for transportation is not without environmental cost. Pollutants emitted from the burning of petroleum have numerous health and environmental impacts, including urban smog and more seriously, global warming. The extraction and transportation of petroleum can also result in environmental damage.