Coal is just one more carbon based fuel. The proof and feasibility for converting coal to petroleum based carbon products is in the laboratories for the future. It is only a question of when, not if.
The Fischer-Tropsch synthesis (inventors Franz Fischer and Hans Tropsch) for converting coal into "petroleum based carbon products) was developed at the Kaiser Wilhelm Institute in the 1920s. This is an indirect coal liquefaction (ICL) process.
in 1913 Friedrich Bergius invented a direct coal liquefaction (DCL) process that turned coal into synthetic oil.
In the 1950s South Africa developed its own CTL process and now has two plants operating with a total output of around 185,000 BPD
The PRC has 9 operating CTL plants with a total output of around 135,200 BPD
The US has 3 operating CTL plants with a total output of around 40,000 BPD.
The future is already about 100 years old.
The real problems with CTL processes is that not only are they incredibly "dirty" but they cost more than the profit margin on petroleum products from "conventional" sources (they are even more expensive than either "fracking" or "oil sands extraction").
My preference both for conscience and investment is renewable energy sources, as well as renewable sources for plastics and other carbon based fuel products, and note sustainable and renewable sources are also carbon based, so is life as we know it. The real problems we are seeing with sustainable renewable sources, is that they too come with an environmental price to pay. I am not interested in getting into a long drawn our discussion on this topic. My time is limited and I have other interests.
I'm with you on "renewable energy sources".
Unfortunately there doesn't appear to be very much readily available material on the TOTAL energy/environmental impact of using them. By that I mean the total energy/environmental impact from initial extraction of raw materials used to construct the "renewable energy collector" (solar power is of no use as a power source unless you collect it) right on through the final disposal/recycling of the no longer functioning "renewable energy collector" PLUS the energy/environmental impact of the "collected renewable energy distribution network".
Retrofitting every house in the country with solar energy collectors would be wonderful, but what would the power grid do with the excess energy collected during the day time? Would it be used to pump water back upstream of the hydro-electric plants?
[ASIDE - In BC the BC Electric company once ran inter-urban trams between Vancouver and Chilliwack (about 60 miles). They used a single wire collector for their electric motors and "regenerative braking". In the middle of the tram line was a large "power station" that consisted of a generator connected to a huge flywheel. When outside power was applied to the tram power line it was used to (a) power the operating trams, and (b) spin up the flywheel if not needed for (a). When the trams used their "regenerative brakes" this fed power back into the line and that power was used to (a) power other operating trams, and (b) spin up the flywheel if not needed for (a). During the course of the operating day, the operating trams would draw more power than was being fed into the system from the outside source and that meant that the flywheel/generator produced power to run the operating trams (and also slowed down). During the night (when the trams didn't run) the outside power was (obviously) more than was needed to run the trams so it was used to speed up the flywheel/generator (and thus "store" the power). That had the effect of allowing the entire tram system to operate at a constant draw rate that was lower than the needed power rate at any given moment.
Old technology was sometimes very sophisticated in its effect, eh wot?]
PS - If the transit company where you live is using "trolley buses" ask them if their buses are equipped with "regenerative brakes" and, if not, why not?