President Obama has nominated Gina McCarthy to succeed Lisa Jackson as EPA administrator.

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As if to underscore his threat, Obama replaced the retiring Jackson with the head of the EPA office that regulates air pollution, Gina McCarthy.

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Gina McCarthy was nominated to head the Environmental Protection Agency and brings a wealth of experience from her position as Assistant EPA Administrator.

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Last week, GOP senators delayed confirmation votes on two of his nominees for cabinet posts: Gina McCarthy for the Environmental Protection Agency and Thomas Perez for labor secretary.

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