The world faces a 50 per cent chance of warming of 1.5 degrees Celsius above pre-industrial levels, if only briefly, by 2026, the World Meteorological Organization (WMO) said on Monday (May 9).
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That does not mean the world would be crossing the long-term warming threshold of 1.5 degrees Celsius, which scientists have set as the ceiling for avoiding catastrophic climate change.
But a year of warming at 1.5 degrees Celsius could offer a taste of what crossing that long-term threshold would be like.
"We are getting measurably closer to temporarily reaching the lower target of the Paris Agreement," said WMO Secretary-General Petteri Taalas, referring to climate accords adopted in 2015.
The likelihood of exceeding 1.5 degrees Celsius for a short period has been rising since 2015, with scientists in 2020 estimating a 20 per cent chance and revising that last year up to 40 per cent. Even one year at 1.5 degrees Celsius of warming can have dire impacts, such as killing many of the world's coral reefs and shrinking Arctic sea ice cover.
In terms of the long-term average, the average global temperature is now about 1.1 degrees Celsius warmer than the pre-industrial average.
"Loss and damage associated with, or exacerbated by, climate change is already occurring, some of it likely irreversible for the foreseeable future," said Maxx Dilley, deputy director of climate at the WMO.