The United States uses a cap and trade system to regulate SO₂ by first setting a nationwide emission limit and issuing emission allowances. At the end of the year,

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Unused allowances in the cap and trade system can be sold, traded, or saved for future use. This provides an incentive for companies to reduce their emissions and sell their unused allowance to other companies who may struggle to reach their allocated emission limit. Fines for exceeding allowances exist but are not the only outcome for companies in this system.

The United States Uses a Cap and Trade System to Regulate