PARIS—The top U.S. environment official says it's time for the United States to shed its energy-wasting image and lead the world race for cleaner power sources instead.

After several years with a relatively low profile under President George W. Bush, the U.S. Environmental Protection Agency "is back on the job," EPA Administrator Lisa Jackson told The Associated Press on Thursday during a trip to Paris.

What the EPA does domestically this year will be watched closely overseas. Nations worldwide are working toward a major meeting in Copenhagen in December aimed at producing a new global climate pact. The U.S. position on curbing its own pollution and helping poor countries adapt to global warming is seen as key to any new pact.

Jackson was in Paris for international talks on how rich governments can include global climate concerns in overall development aid.

She dismissed worries that economic downturn was cutting into aid commitments or investment in new energy resources. She said the United States should take the lead on clean energy technology, recession or no.