To avoid the worst effects of climate change, we must limit global warming to 1.5°C.
An average global temperature rise above that would create risks that the global economy cannot withstand.
To hit this target, the Intergovernmental Panel on Climate Change has said humanity must halve its carbon emissions over the next decade, do so again during the 2030s, and yet again during the 2040s, to achieve net-zero emissions by 2050.