Which of the following fuels would produce minimum environmental pollution? निम्नलिखित ईंधनों में से कौन न्यूनतम पर्यावरणीय प्रदूषण उत्पन्न करेगा?

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Which of the following fuels would produce minimum environmental pollution? निम्नलिखित ईंधनों में से कौन न्यूनतम पर्यावरणीय प्रदूषण उत्पन्न करेगा?