AP Photo

Beyond the photo ops and press statements, Obama was pushing President Hu Jintao and Prime Minister Manmohan Singh for the kind of climate deals that eluded him at the G8 summit in Italy in the summer – and have eluded international negotiators for the last decade. China and India have played central roles in blocking past agreements, alongside the US, in a seemingly intractable dispute between fast-developing economies and the older, wealthier polluters.

Now Obama is at the point where he feels on the verge of a breakthrough, based on the kind of talks that don’t get covered by reporters obsessing about state dinners. “He had extensive conversations with President Hu specifically on climate and conversations with the prime minister of India,” said one senior White House...