I may be wrong, but I feel like you missed the point of the post above you... the "$20 trillion dollar bank account", I took to be an analogy for the world's fossil fuel reserves. Which, if we want to avert climate change, we probably have to take a significant fraction of and leave it in the ground.
All the focus is on reducing demand by reducing usage, and that would theoretically force fuels to be sold cheaper until the point where it's not economically viable to extract them. But it seems like an indirect approach compared to convincing a government that controls a lot of fuel reserves to just stop drilling them out and leave them buried.
But of course it's not really 'realistic' to expect them to do that - they're sitting on a bottomless well of wealth just begging to be dug up. It would make them uncompetitive to stop, it would mean other nations continue to profit while they sit on their hands, it would weaken their position of power on the world stage... it would help save the ecoystem of the planet, but clearly that's of no particular importance compared to wealth and power.