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BONN, Germany — The senior American diplomat at the United Nations climate talks here told world leaders Thursday that the United States would remain engaged in global climate change negotiations even as it planned to exit the Paris agreement “at the earliest opportunity.”

Judith G. Garber, a State Department acting undersecretary, gave the first official American remarks to the United Nations climate body since President Trump announced in June that he would abandon the Paris deal. It was a far more conciliatory message than a presentation earlier in the week by White House officials promoting fossil fuels, which drew catcalls and a walkout.