Automobile tailpipe emissions have been enforced primarily through

Question

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Automobile tailpipe emissions have been enforced primarily through a new car certification program, which sets emissions standards for new vehicles and requires manufacturers to meet those standards through technology improvements and other measures. Cap and trade programs, higher gasoline taxes, and requirements to shift to electric vehicles have also been used as strategies to reduce emissions, but they are not the primary means of enforcing emissions standards for tailpipe emissions.

Automobile Tailpipe Emissions Have Been Enforced Primarily Through