It is hoped the UN's climate summit, COP28, will help keep alive the goal of limiting long-term global temperature rises to 1.5C above pre-industrial levels.
Scientists say that staying below the 1.5C threshold is crucial to avoid the most severe and irreversible climate change impacts.
However, recent UN estimates suggest the world is "way off track" in meeting that goal.
As a result, the UN says, the window for keeping the 1.5C limit in reach is "rapidly narrowing".
2023 has already been a year of extreme weather events in which many temperature and emissions records have been broken.
But outside of the COP28 conference rooms, how many people really understand the significance of 1.5C?
Watch our video to see whether people in Maynooth, Co Kildare, could identify and explain its importance.