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Cop21 Primer: A brief history of climate negotiations
November 24, 2015 Last updated at 11:20 GMT
Next week, representatives from 195 countries come to Paris to take on a major UN climate summit.
Results of previous sessions ranged promise frankly disappointing, ended without agreement, and in some cases bitterness.
But there are high hopes that it will be different.
Reported the BBC Newsnight correspondent Rebecca Morelle Science is the story so far.
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