"President Obama and Prime Minister Modi have a very, strong and productive relationship, not just on climate change but broadly," Todd Stern, the US Special Envoy on Climate Change said yesterday.

Thereafter the two leaders have been close communications with each other. "They met on the margins of the UNGA in New York and they met on the first day of the Paris meeting," Stern said.

"In fact, they talked so long that – they were both supposed to go – and did go finally, but they were a little bit late to the announcement of this big Mission Innovation idea on R&D that both – well, the United States, India, China, many other countries ultimately were part of," the US official said.

"So I think, that the call later, sort of more towards the end, was a check-in call to see how we were doing and to urge us all on together toward a successful conclusion. And I think it was done in that spirit, not in the spirit that there was some specific thing that had to be done before the agreement could get completed," Stern said.

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