Successful Paris climate change deal 'cannot be based on voluntary pledges'
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In nine months France will host the largest environmental conference of the decade. The stakes are high: this is perhaps the best chance the world will ever have of limiting greenhouse gas emissions. A successful deal would replace the Kyoto Protocol, which is marking its tenth anniversary.
Laurence Tubiana is leading France's climate change negotiations. She tells us how optimistic she is of a deal in December.