Let's not forget all the senior citizens who rely on income from investments in fossil fuel companies, this includes most of the parents of the under 45 who like to say, "screw the oil companies"
The companies that stand to gain are likely to be publicly traded as well.
If those senior citizens have index funds or mutual funds, they'll be fine because the indexes automatically rebalance to the companies with the highest market caps.
Or sell those assets now before they depreciate: divest from fossil fuel and invest in in sustainable energy.
Sell them to who?
Someone who likes to buy small-cap-value companies. This person could be domestic or overseas and might not care about US corporate negative externalities; just the dividend yield.
They can literally put in a sell order at any time