The World Meteorological Organisation has said 2017 is very likely to be one of the three hottest years on record.
The European Environmental Bureau NGO called for "immediate measures" in response to the "state of emergency".
In its State of the Global Climate report the WMO said that while the current year has been cooler than record-breaking 2016, it will be the warmest not influenced by an El Niño event.
The report, which covers January to September, said 2017 was a year of high-impact weather events including “major and devastating hurricanes”, floods, heatwaves and drought.
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