text: Another continuing measure to reduce emissions is high gasoline taxes. Taxes have been increased to exorbitant levels in most western European nations, so that the typical price of gasoline is now over $7 per gallon. Yet emissions from the transportation sector have increased 26% since 1990, according to the European Environment Agency. It should be noted that each one dollar of tax per gallon of gas translates into a tax of approximately $100 per metric ton of carbon dioxide emissions.