2. The global wealth invested in Hydrocarbons, ...
almost guarantees your prognosis for civilization.
Think of the value of stocks and bonds, the collateralized debt derived from the ownership of said instruments; and then find which bank, stock exchange, or national treasury can devalue by 90% the fossil fuels counted as reserves, and still be solvent. And that is just the naked economics.
To use the hydrocarbons is suicidal, to not use them is the collapse of credit, commerce and civilization. Like you, I can not imagine a solution to this enigma. I'm am only left with a curiosity, of how it will unfold, and how soon.