The U.S. brushed aside demands from Brazil, China and United Nations Secretary General Ban Ki-moon for richer countries to detail how they’ll deliver $100 billion in climate aid by 2020.

“The question of whether there’s a new commitment that gets announced here isn’t the right question,” Jonathan Pershing, a U.S. negotiator at UN global warming talks, told reporters in Doha today. If nations ask whether the U.S. is working on the goal, he said, “the answer is yes.”