alternative fuel

noun

a vehicular fuel that is not entirely derived from petroleum, as natural gas, hydrogen, or an alcohol mixture:
the environmental benefits of alternative fuels.

First recorded in 1905–10

In the late 1980s it took off as the environmentally correct alternative fuel, but that's been disproved as well.

We took it on with green building, public transit, alternative fuel and power, recycling, and other issues.

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