From a New York Times story by Peter Baker headlined “New Oral History Peers Back at Obama, His Era and the Tradeoffs He Made”:

On a day of high drama at an international climate change conference early in his administration, President Barack Obama confronted a senior Chinese official who offered what the American delegation considered a weak commitment. Mr. Obama dismissed the offer. Not good enough.

The Chinese official erupted. “What do you mean that’s not good enough? Why isn’t that good enough?” he demanded. He referred to a past conversation with John Kerry, then a Democratic senator from Massachusetts. “I talked to Senator Kerry and Senator Kerry said that was good enough.”