Experts in climate change from all over the world are gathering in South Korea to finalise a significant report on the impact of global warming of 1.5ºC.
The UN's Intergovernmental Panel on Climate Change includes representatives of 195 governments, who will work with scientists to put the finishing touches to the report.
The Summary for Policymakers will then be published next week.
"Governments have asked the IPCC for an assessment of warming of 1.5ºC, its impacts and related emissions pathways, to help them address climate change," IPCC Chair Hoesung Lee said.
"Together we will produce a strong, robust and clear Summary for Policymakers that responds to the invitation of governments three years ago while upholding the scientific integrity of the IPCC."
The research will look at the impacts of global warming of 1.5ºC above pre-industrial levels and related global greenhouse gas emission routes.
The IPCC is carrying out the work in order to strengthen the global response to the threat of climate change, sustainable development and efforts to eradicate poverty.
The study was commissioned by governments following the adoption of the Paris Agreement in 2015.
It aimed to strengthen the global response to the threat of climate change by keeping a global temperature rise this century well below 2ºC above pre-industrial levels and to pursue efforts to limit the temperature increase even further to 1.5ºC.
"Global mean temperatures in 2017 were about 1.1°C above pre-industrial levels," said WMO Deputy-Secretary-General Elena Manaenkova.
"Unfortunately we are already well on the way to the 1.5°C limit and the sustained warming trend shows no sign of relenting. The past two decades included 18 of the warmest years since records began in 1850.
"This year is, yet again, expected to be one of the warmest years. We have witnessed extreme weather ranging from record heat in northern Europe and historic flooding in Japan, India, southeast Asia and the southeastern United States."
He added: "The consequences were devastating, but advance predictions helped save many lives".
The IPCC is the UN body for assessing the science related to climate change and is co-sponsored by the World Meteorological Organization and United Nations Environment Programme.
It assesses thousands of scientific papers each year and then distills the information for policymakers, so they can make informed decisions around climate policy.