Natural gas can be converted into a liquid fuel that can then be refined into gasoline or diesel. These gas-to-liquid fuels are also known as Fischer-Tropsch fuels; they are named for the German researchers who invented the process. Researchers have found that engines running on gas-to-liquid diesel fuels have lower exhaust emissions than conventional diesel engines do.
Solid-fuel resources such as biomass and coal can also be converted to gas in a process known as gasification. The resulting gas can then be converted to a liquid Fischer-Tropsch synthetic fuel.
Learn more about gas-to-liquid fuels.