This is huge problem folks.
When Trump comes in and tries to reverse the regulations or executive orders, the environmentalists will go to court saying that eliminating the regulations will damage the environment. Even though these are not laws passed by Congress and are just administrative regulations, the court will usually agree.
This happened with Bush where Bill Clinton designated huge areas of land as Federal wilderness areas at the last moment. When Bush tried to reverse the orders, there were court fights and Bush lost on many of the those.
What the courts are doing is allowing the previous President to handcuff the new President. It will happen again unless Congress passes laws to undo the regulations.
That is my understanding too.
I think the safest way is to complete a new study and revise the existing regulations. It will take time.
They also need to clean house in the justice department and review all settlements.
Another approach would be to have someone sue on the new rules to a friendly judge and have the judge overrule them and put is a settlement that kills the regulation.
Declare EPA mission accomplished and disband the central authority back to each separate state.