It is unlikely a binding deal to combat climate change will be achieved at the Copenhagen summit in December, a senior UN official has said.
The government is predicting a deal could be up to a year away.
David Shukman reports from Barcelona.  WATCH THE BRIEF VIDEO FROM THE BBC

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Oil and gas are essential to our global economic wellbeing. But are Solar energy, wind power and the other alternatives ready to lessen the burden oil and gas are currently shouldering. Lets take an unbiased look at each of the most likely alternate energy sources, focusing on both the advantages and disadvantages of each.
As 3rd [...]