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In page Climate change in the United States:

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The federal government has the exclusive power to regulate emissions from motor vehicles, but has granted the state of California a waiver to adopt more stringent regulations. Other states may choose to adopt either the federal or California rules. Individual states retain the power to regulate emissions from electrical generation and industrial sources, and some have done so. Building codes are controlled by state and local governments, and in some cases have been altered to require increased energy efficiency. Governments at all levels have the option of reducing emissions from their own operations such as through improvements to buildings, purchasing alternative fuel vehicles, and reducing waste; and some have done so.[citation needed]