Accounting isn't just lying with numbers. Those are real costs whether they're paid for in cash or otherwise. They may be hard to estimate, but they're real costs.

For example, if you build roads and don't charge users to use them, they are going to use those roads more than if you charged users the costs that they incur for construction and maintenance. Building roads but not charging for their use is a subsidy to vehicle use, which is also a subsidy to all of the inputs of vehicle use, including mining, manufacturing, and yes, fossil fuel consumption.

The same goes for environmental costs. You either pay for them with cash or you pay for them with a destroyed environment. And even with a destroyed environment, you're probably still paying in cash, just indirectly, deferred substantially, and with significant interest.