Key global climate talks will be be hosted by the UK in Glasgow in November 2021.

Campaigners for action on global warming say the summit will need to agree tough and radical reductions in carbon emissions if they are to limit the worst effects climate change.

So what are the main challenges facing those trying to forge a new agreement at the talks?

Huw Edwards presents BBC News at Ten reporting by science editor David Shukman.
Please subscribe HERE http://bit.ly/1rbfUog

#BBCNews