press arrow keys <---- DO THIS (note speaking in the perspective of COSS chemists, engineers and scientist) replacing pressured gas instead of gunpowder doesn't seems feasible all attempted fail combustion light-gas gun are also a possibility hydrogen or methane could be the propellant fuel a Liquid propellant is more feasible such as carbonic acid (letting liquid C02 dissolve in water) or nitrocellulose (made out nitric acid and sulfuric acid) funds - 500 billion nocks from CCP for this so that is quite the cash amount
would require CO2 capturing plants and then transporting them in tanks into the mountains for liquefaction process (during winter) Coal liquefaction plants are going to be expensive to build but can produce high quality synthetic fuels Coal Gasification is also a thing (1927)
