The US is set to lead the world towards a new climate deal, according to John Kerry - but only if other countries pledge emission curbs too.
The former US presidential candidate said here at the UN climate conference that the aim of agreeing a new global deal next year must remain on track.
But a deal could not work unless it covered all countries, he added.
A number of dignitaries said they were looking forward to working with Barack Obama's incoming administration.
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