If you crash a company against the wall resulting in such a disaster and having to cut so much staff, resigning isn't enough. CEO's should have to pay back big parts of their compensation.
people talk about ESG... imagine what the world would look like if energy company executives were compensated based on the health of the company (and by proxy the health of the economy) ten years in the future...
also maybe more tax rules along the lines of long/short cap gains that reduce the short term time value of money.
What you described is supposed to be part of the "G" in "ESG".
Will the board return their board fees?
I'm serious. If there were any risk at all that he might lose a cent, he would never admit anything in a way that could be referenced by a lawyer.