If you want to argue we should levy a trillion dollar tax on fossil fuels that's fine but let's at least be direct about it instead of the somewhat misleading statement that it's a subsidy, like it's some giant pile of cash the state is handing to the oil companies. It's not even that it's giving tax breaks (that would be an explicit subsidy), it's that these taxes didn't exist at all.
You're essentially arguing not being taxed to oblivion as being directly supported by the government.