They always go bust before they clean up their mess since you can plan for that.
So can the central government say don´t do that or are they unlikely to do so?
In general to prevent that there is sometimes a push to require companies set aside money for cleanup. Companies wait for a little while and reduce it to a token amount or get the requirement changed or lifted entirely. Or they get the rules changed so they can spend it. Funds were supposed to be set aside to clean up oil wells. The original requirement may have been sufficient but that never lasts.
Where are the auditors requiring adequate provision for liabilities like clean up costs to be built up over the period of time the oil wells are generating profits?
Well if this is tipping the company into negative assets, should the company go bankrupt immediately? That would ensure there isn't enough provided for. So in such a situation, there can be a pressure to understate such liabilities for the moment in the hope better times come which will allow more of a liability provision to be built up.
Do you want stricter rules that would make companies go bankrupt sooner?
If better times are a real possibility then some turning blind eye to underestimates in such calculations may be sensible. If the reality is that better times are not coming then the government left with such liabilities perhaps should be able to pursue the auditors but the auditors limit their liability to the shareholders as a body however and wherever they can.
Meanwhile directors want their salary and bonuses to continue so they continue putting lower estimates into clean up cost calculations.
Perhaps a different liability provision requiring full provision the moment you start would help but this might mean many projects never get started because it would be too big a hit on profits. That isn't what the government has wanted in the past want gdp increases now and problems in more than 20 years time have little if any meaning to politicians that won't be in power then. Perhaps with new ff projects soon disappearing it would be sensible to be brought in for this sector? Then what about nuclear?
Lots of different groups with different priorities. Perhaps a required ff extraction industry insurance to pay for clean up where companies go bust would work better? Think it would need rapidly increasing premiums over next couple of decades. If that kills off the sector earlier so much the better?