synfuels

Noun

synfuel (countable and uncountable, plural synfuels)

1. Any of several fuels synthesized from coal or shale etc, or fermented from grain etc.
   • President Jimmy Carter was proposing a major effort to increase U.S. energy independence by developing “synfuels”—liquid fuels made from coal, oil shales, and tar sands—and scientific experts had warned that this could accelerate CO₂ accumulation.2010, Naomi Oreskes, Erik M. Conway, chapter 6, in Merchants of Doubt
2. Any of several fuels created by chemical synthesis from simple feed stock inputs, of power, energy, heat, water, carbon dioxide, or simple compounds.