A landmark United Nations (UN) report warns that the world is likely to cross the 1.5°C global warming limit by around 2030, but temporary overshoot can still be reversed later this century.
The Paris Agreement (2015) aims to keep global warming well below 2°C and pursue efforts to limit it to 1.5°C above pre-industrial levels.
The world is already about 1.4°C warmer than pre-industrial levels, and crossing 1.5°C could increase extreme weather, sea-level rise, biodiversity loss, and other climate risks.
With rapid fossil fuel phase-out and emission cuts, warming could potentially be limited to around 1.8°C, followed by carbon removal to bring temperatures back to 1.5°C or below.
Carbon dioxide removal could involve tree planting and ecosystem restoration, while technologies such as rock weathering and ocean alkalinity enhancement are still not proven at large scale.
The report stresses urgent emission reductions, international cooperation, climate finance, and strong political action to keep the 1.5°C goal within reach.