You guys are on the right track, but if you take the logic a little farther you can see that natural gas is the obvious replacement for oil.
LNG is being used today as a direct replacement for diesel fuel in a wide variety of high horsepower machinery, such as container ships, drill rigs, enormous mining trucks and soon freight trains. There is no other game in town for replacing diesel in these in these high volume applications.
Natural gas is simply methane, and methane is our most abundant fossil fuel and our most abundant renewable fuel. Whereas ethanol and biodiesel require engineering compromises to utilize and have serious questions about scalability, methane does not. Biomethane is chemically identical to fossil methane and can be blended without restriction, a true 'drop-in' fuel. We can also produce robust quantities of biomethane, there are trillions of cubic feet available from waste resources alone.
Natural gas enables intermittent renewables and also enables carbon capture. And the best way to mitigate concerns over methane emissions is to capture them and use them for fuel.
Methane is non-toxic, abundant, renewable, and a universal fuel that can be used across the entire energy spectrum.