Scotland is in the very slow process of manufacturing new ferries that will run on Methane.
LNG is a good fuel for ships. It would be a good fuel for heavy trains and heavy agriculture and quarry plant.
It is transportable, less strain on the engine, so the engine should last longer. Most useful for electricity back up production. Less polluting than petrol or diesel.
But the three main things are to stop the increase in human numbers.
Allow people to choose less stuff, this could be done with campaigns on the T.V. by our government by many governments.
The next is to stop the felling of the forests, especially complex rainforests, which suck down a lot of greenhouse gases but also retain huge biodiversity, once you clear fell a tropical rain forest you kill their biodiversity and it will take much time, if ever, to recover.
Most forests are clear felled for short term nonsense, like meat for dogs.