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Can you give me some examples of gas being subsidized?

"This is standard economics theory, you tax any form of an environmental damage (e.g. carbon) at the rate of what it costs to clean it up."

Again, that's a choice for which the population's opinions differ. You have some people who would tax people for existing because of their carbon dioxide output, body heat, space they take up, etc.

Roughly 90% of global air travel passengers are non-Americans.

Gasoline is heavily taxed as well, far in excess of the subsidies it receives compared to typical consumer goods. Jet fuel itself has almost no tax net of its subsidies, however passenger aviation is also heavily taxed compared to most consumer goods. It is for sure incorrect in both cases to say that these goods are “heavily subsidized” as a way to absolve consumers of any responsibility for their ecological choices.