US Special Envoy for Climate Change Todd Stern also described the meeting of President Barack Obama and Prime Minister Narendra Modi in Paris on the inaugural day of the conference as 'striking' in which the leaders had an 'extraordinarily rich' exchange.

"The two leaders have a great rapport which is good to see. The president is very substantively tuned into the issues. Prime Minister Modi was ready to do the same. It was a good conversation," he said.

He said that he had four to five meetings with Indian counterparts in the last one week and both nations are working "quite intensively in a business and constructive way".

The comments come in the backdrop of Secretary of State John Kerry's remark that India is a 'challenge' in the Paris talks.

India has also been targeted by the western media on its expansion plans of coal usage to meet its energy requirements.

Stern in his earlier interaction had said that the ambitious renewables programme including scaling up solar and wind energy pledged by Prime Minister Modi is 'enormously impressive' and US will work with Indian partners and provide assistance in realising their goals.

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