Climate changes: World has seen 'warmest year'

This year is in the running to be the hottest globally and for the UK since records began, early estimates have shown.
In the first 10 months of 2014, global average air temperature was about 0.57 Celsius above the long-term average.
And the first eleven months in the UK have produced an average temperature 1.6C above the long-term.
David Shukman reports.