Following the Supreme Court's directive, the entire fleet of public transport (buses) in Delhi was switched from diesel to ________ by the end of 2002.
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Correct answer: CNG (Compressed Natural Gas)
CNG was chosen as a cleaner alternative because it burns more efficiently than diesel or petrol, leaving very little unburnt residue. Additionally, CNG is cheaper and cannot be siphoned off or adulterated easily.
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