I think hydrogen fuel cells will be the most likely candidate to replace petrol. Fortunately the world's Chemists are very close to producing a synthetic route to hydrogen that is completely free of direct/indirect Alkane/Hydrocarbon use. I think it could be done within 10 years.
This recent idea is very exciting, unfortunately Physics is the popular science and commonly steals all the media attention from Chemistry.
Nuclear Fusion will be done within 50yrs and Coal power will be redundant by then. It already has been done for a very short period of time:
. An end to factory farming which contributes enormous amounts of CO2 and CH4 to the atmosphere, is bad for animals and the environment alike. The world's meals will eventually either be Synthetic Protein with vegetables or simply vegetables. The system is highly unsustainable even with every Global Warming solution. It will have to end.
. A vast reduction in human population size. World governments will have to impose strict birth control measures like China, there is already too many of us. The earth cannot feed 11 billion humans.
Well that's the evidence of where the world's valuable bright-sparks are heading. I wonder what the deniers can offer? Burn more of course! Combustion is the only way!
We landed a washing machine on a comet over a billion miles away, Alan Turing shortened WW2 by years, We are curing cancer, We unlocking the mysteries of the smallest Quarks to the largest Black Holes.
If humans can do all that, then I believe we can stop Global Warming, we can treat animals as equals and we can create Jobs while doing it. Trump certainly doesn't but then again he enjoys having instant gratification rather than every Scientist, who knows Science is slow and hard but eventually all the work is rewarded in moments of major breakthroughs.
It's like a apple tree, takes 60yrs to grow but eventually it will produce fruit.