燃烧燃料产生这些“负外部性”的事实并不意味着燃油税不会太高。
The fact that burning fuel creates these "negative externalities" does not imply that no tax on fuel could ever be too high.
从经济学的角度来看，为了应对负外部性，原则上应该征收的税收是准确的：对一升燃料征收的税应该等于使用一升燃料所造成的危害。
Economics is precise about the tax that should, in principle, be levied to deal with negative externalities: the tax on a liter of fuel should be equal to the harm caused by using a liter of fuel.
煤炭是污染最严重的化石燃料且因为它对环境的负外部性使其价格便宜。
Coal is the filthiest fossil fuel and is cheap only because its dirtiness isn't included in the bill.
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