A year with temperatures more than 1.5C above pre-industrial levels mean it is likely the world is reaching the key long-term warming threshold, studies suggest.
Under the global Paris climate treaty secured in 2015, countries agreed to limit global warming to “well below” 2C and to pursue efforts to curb temperature rises to 1.5C above pre-industrial levels to avoid the worst impacts of extreme storms, floods, heatwaves, rising seas and the collapse of natural systems.
