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Gina McCarthy, Assistant Administrator with the Environmental Protection Agency, speaks at a climate workshop sponsored by The Climate Center at Georgetown University, Thursday, Feb. 21, 2013 in Washington. President Barack Obama is poised to nominate McCarthy as head of the powerful Environmental Protection Agency. McCarthy, who currently heads the EPA's Office of Air and Radiation, reportedly has the inside track to replace Lisa Jackson, who officially stepped down from the agency last week. (AP Photo/Alex Brandon)