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Petroleum products raise environmental red flags even before they are burned. Extracting them from the earth is an energy-intensive process that can damage local ecosystems. Shipping fuels can also consume a lot of energy, and creates an occasional environmental disaster such as an oil spill. As world demand rises, and unconventional fuel sources, such as oil sands, become more economically viable, the ecological impacts of petroleum extraction might also increase dramatically. That’s one more reason why fuel efficiency is so important.
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