The treaty in question is called the Energy Charter Treaty, and apparently if changes are not made by November we will look at exiting.
What is in this egregious rules? Well, it would be run with a system of secrets of courts, and it would allow a company to sue any signature country should they bring an a law that might cut their profits in the future.
Given that any cuts in coal use, oil use, wood or many other things would impact many companies bottom line. Given that coal and oil use must cease within the next couple of decades, and only wood from land that would be replanted, the vast majority of companies would have their profits hit.
This foolish treaty would either lead to governments abandoning all carbon reduction targets, or paying large companies billions for all time.
This treaty is not centuries old, rather, it came into being back in 1998, at a time where we knew about climate change. France is similarly talking about quitting. Other countries are also looking at leaving, and it is thankfully likely to collapse.
It is strange how this possible became a treaty, as this plan is insane.