Subsidized in what way? I've heard many dubious things in the UK / EU called "fossil fuel subsidies" when it's mostly generic things like electricity having a lower VAT rate than the usual 20% (or whatever) on most consumer goods. This is the sort of thing that gets called a fossil fuel subsidy. I think a lot of these things are grasping at straws.
The top subsidy of fuels that emit carbon emissions is the externalities experienced by future generations. Not really measured in numbers, it will just be a change in quality of life.
