To extend on that, the US releases about 5.1 billion tons of CO2 in a year. Each gallon of gasoline release roughly 20 pounds of CO2. That means that 1 gallon of gas would be taxed at $7.84 if we pollute at our current rates.
Tbh, I would be very much in favor of this. I know it's not a popular opinion, but things that pollute this much should not be the easiest/cheapest solution.