Things will change the exact second that existing petro-wealth figures out how to make more off of green power in the next quarter than by continuing to destroy the earth. I wonder if, ironically, that day will be highly delayed because they missed the opportunity to buy in at the bottom.
Everyone could see that greentech would be a trillion dollar industry. If nothing else, nobody after 1950 ever pictured oil derricks in their sci-fi worlds. So you'd expect the firms that already knew energy-- the oil companies and utilities-- to take a speculative punt on every new tech just as they'd buy into new oil-fields.
But I guess a dollar reinvested in the goo industry in 1980 was the sure thing-- worth more than the chance to own a chunk of the new economy in 2040. Will ExxonMobil or Shell be willing to pivot into solar/hydrogen/battery/etc tech at today's prices, or will they just use their political leverage to maximize the extraction and damage thry can do with their assets until they become complete write-offs?