Global Temperatures Likely To Exceed Key Limit For First Time

With October's initial temperature data in, 2024 will rank as the first calendar year in modern record-keeping in which global average surface temperatures exceed the Paris Agreement's aspirational 1.5C guardrail. From a report:Holding long-term warming to the 1.5-degree target compared to the preindustrial era is crucial for lowering the risk of triggering climate change tipping points, beyond which potentially catastrophic impacts have a higher likelihood of occurring, studies show. Holding warming to that target is viewed as necessary for small island states and other extremely vulnerable nations to avoid being wiped out by sea level rise, drought and other threats.

The data -- and proxy records such as tree rings and ice cores -- shows this year is likely to be the hottest in at least 125,000 years. Right now, the world is on track for as much as 3.1C (5.58F) of warming based on already pledged emissions cuts, assuming they are fulfilled. Copernicus Climate Change Service reported early Thursday that the year is headed for a temperature anomaly of more than 1.55C (2.79F) above preindustrial levels. Last year fell just shy of the 1.5C threshold relative to the 1850-1900 average.

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