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ScienceMay 28

UN report projects global temperatures to reach near-record highs over next five years

World Meteorological Organization forecasts 75% chance Earth will exceed 1.5°C warming threshold between 2026-2030, with significant Arctic warming expected.

Synthesized from 3 sources

Global temperatures are projected to reach near-record levels over the next five years, with a high probability of exceeding key climate thresholds, according to a new report from the World Meteorological Organization and the United Kingdom's Meteorological Office.

The report forecasts a 75% chance that average global temperatures between 2026 and 2030 will surpass 1.5 degrees Celsius (2.7 degrees Fahrenheit) above pre-industrial levels. This threshold represents the warming limit established in the 2015 Paris climate agreement. Additionally, there is a 91% chance that at least one year within the next five will exceed the 1.5-degree mark, and an 86% chance that one of those years will break 2024's record as Earth's hottest year.

The projections, based on approximately 200 computer simulation runs using 13 different climate models, indicate that each year through 2030 will likely see temperatures between 1.3 and 1.9 degrees Celsius above late 1800s levels. Report co-author Melissa Seabrook from the U.K. Meteorological Office noted that crossing the 1.5-degree threshold is not a "cliff edge" but represents increasingly severe impacts with each additional tenth of a degree.

The Arctic is expected to experience particularly dramatic warming, with temperatures rising 3.5 times faster than the global average. The region could warm nearly 3 degrees Fahrenheit (1.66 degrees Celsius) between now and 2030. This accelerated warming occurs as melting ice and snow reduce the surface's ability to reflect solar radiation, creating a feedback loop that intensifies the warming process.

The report also projects concerning regional impacts, including drier and warmer conditions in the Amazon basin that could increase wildfire risk and potentially transform the rainforest from a carbon sink into a carbon source. Conversely, Africa's Sahel region, currently experiencing drought conditions, may see above-normal rainfall that could lead to flooding.

A strong El Niño weather pattern, which naturally warms parts of the central Pacific and affects global weather, is expected to contribute to the elevated temperatures and could persist until 2028. Climate scientists indicate this pattern may cause 2027 to break the 2024 heat record. UN officials emphasized that current climate change mitigation efforts remain insufficient to prevent these projected temperature increases.

Sources (3)

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