The World Meteorological Organization (WMO) says that the physical and financial impacts of global warming are accelerating. Click here to read the full story.
Record greenhouse gas levels are driving temperatures to "increasingly dangerous levels", it says.
Their report comes in the same week as the International Energy Agency (IEA) reported a surge in CO2 in 2018.
However, new data from the UK suggests Britain is bucking the trend with emissions down by 3%.
This year's State of the Climate report from the WMO is the 25th annual record of the climate.
When it first came out in 1993, carbon dioxide levels were at 357 parts per million (ppm) in the atmosphere. These have now risen to 405.5ppm and are expected to increase further.
This is having a significant impact on temperatures, with 2018 the fourth warmest year on record, almost 1C above what they were in the period between 1850-1900.
The years between 2015 and 2018 were the four warmest on that record, the study says.
"This report makes it very clear that the impacts of climate change are accelerating," said Prof Samantha Hepburn who is director of the Centre for Energy and Natural Resource Law at Deakin University in Australia. "We know that if the current trajectory for greenhouse gas concentrations continues, temperatures may increase by 3 - 5 degrees C compared to pre-industrial levels by the end of the century and we have already reached 1 degree."
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