COP21 primer: A brief history of climate talks
Next week, representatives from 195 countries will arrive in Paris to take part in a major UN climate summit.
Outcomes of previous meetings have ranged from promising to downright disappointing, ending without agreement and in some cases acrimony.
But there are high hopes that this one will be different.
Reporting for BBC Newsnight, science correspondent Rebecca Morelle has the story so far.
- 24 November 2015
- BBC News