UN scientists warn of a narrowing window to limit warming to 1.5C
A landmark IPCC report found that limiting warming to 1.5 degrees would require unprecedented, rapid changes across society.
The world's leading climate scientists issued a stark warning this October, concluding in a landmark report that limiting global warming to 1.5 degrees Celsius — the more ambitious goal of the Paris Agreement — would require unprecedented and rapid transformations across every sector of society within a narrow window of time.
The special report from the Intergovernmental Panel on Climate Change laid out in sobering detail the difference between 1.5 and 2 degrees of warming. Half a degree, the scientists found, could mean the difference between coral reefs surviving in some form and their near-total loss, between manageable and catastrophic sea-level rise, and between the preservation and devastation of countless ecosystems.
To keep warming to 1.5 degrees, the report found, global carbon dioxide emissions would need to fall dramatically over the coming decade and reach net zero around mid-century, requiring sweeping changes in energy, industry, transport, buildings and land use.
The findings landed like a thunderclap, framing climate action not as a distant concern but as an urgent imperative requiring immediate and far-reaching change. Campaigners seized on the report's implied timeline as a rallying cry.
While daunting, the report also stressed that limiting warming remained physically possible, and that every fraction of a degree avoided would reduce the harm. It became one of the most consequential scientific documents of the era, reshaping the climate debate and galvanising a new wave of activism and ambition.