2015 becomes warmest year on record, say meteorologists
Global temperatures in 2015 were the warmest on record, according to data published by meteorologists in the UK and US.
The Met Office figures show that 2015 was 0.75C warmer than the long-term average between 1961-1990.
US data suggests that 2015 "shattered" the temperature record by the widest margin ever recorded.
David Shukman reports.