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This sounds like a big number, but when put into perspective, it's pretty insignificant. Given that, according to Wikipedia, there are more than 243,023,485 passenger cars in the US, the emissions of fireworks amount to 5 THOUSANDTHS OF A PERCENT of the emissions of automobiles. Improving the average car's mileage by a tenth of a mile per gallon would have a FAR greater effect on CO2 emissions than eliminating fireworks.