I appreciate the theory Mike, and you might be correct that if people in economically developing countries were paid enough money (yes, way more than $100 billion) it might work to dissuade them from using fossil fuels, but one of many questions you'd have to ask is, in reality, 'who' would really be paying the bill?
Likely it would be in the form of additional taxes, just like green-levies and green taxes now, imposed on the fuel bills of ordinary tax payers in the UK and elsewhere - disproportionately poorer people. Again, these taxes are hugely regressive. Even if there was a magic solution to conjure up the mega-billions of dollars needed, that money would inevitably also have been diverted from public services in developed countries where it would otherwise have been spent. That's not a problem if you're middle-class and relatively wealthy of course, as you rely less on public services.
Let's not also forget that "just stopping oil" impacts on nitrogen and fertilizer production, and our ability to feed people. These not so clever 'green' government policies have already contributed to social unrest in Sri Lanka and the Netherlands, for example. https://www.dtnpf.com/agriculture/we...lizer-help-sri Letting billions of people starve isn't a good green look.
Slowly reducing dependency on fossil fuels, while simultaneously and genuinely investing in alternative technologies (to include nuclear) seems to be the only compassionate, sane, and ethical way ahead.