Without fossil fuels we’d not have had progress. We’d have wood fires to cook, no AC, lots of missing modern inventions.
Now if fossil fuels were made illegal or were used illegally, sure. But it’s not like the gov outlawed them and now they are seeking damages.
If you want to sue, sue Jane Fonda and her then allies who misled people, corporation and government resulting in 50 lost years of nuclear power progress.