This article originally appeared on Inside Climate News, a nonprofit news site dedicated to climate issues.
The Pacific Ocean plays a crucial role in our climate. Its heat can influence storms, rainfall, and marine life across the globe. Scientists are currently watching for a possible strong El Niño, which is the warm phase of this ocean-atmosphere cycle.
Climate change has already raised global temperatures, and a powerful El Niño in the next 12 to 18 months might push average temperatures past the critical 1.5 degrees Celsius mark. This threshold has been identified in key climate reports as the point where serious, potentially irreversible impacts on the environment may occur.
Experts recently noted that strong El Niños can lead to “climate regime shifts,” which are sudden, long-lasting changes in rainfall, heat, and drought patterns. El Niño acts like a giant heat release valve, pushing warm water across the Pacific. This surge can disrupt weather patterns globally, causing everything from intense storms to prolonged droughts.
For instance, the previous strong El Niño in 2015 led to a record high global temperature, which hasn’t dropped below 1 degree Celsius above the pre-industrial baseline. In 2024, our planet experienced its hottest year on record, significantly fueled by another El Niño.
Even a moderate El Niño can increase the average global temperature to around 1.7 degrees Celsius, according to climate scientist James Hansen. He warns that cooling back below the 1.5 degrees Celsius mark may not be possible after such an event.
Surpassing this threshold might not trigger immediate disaster, but it marks a dangerous point where ecosystems and weather systems—stable for millennia—could dramatically shift. For example, California has seen years where reservoirs fail to fill, and extreme rains lead to floods. Meanwhile, coral reefs worldwide are showing signs of irreversible damage, and crop growth cycles no longer match seasonal changes.
What Makes “Super El Niño” Different?
Study findings suggest that strong El Niños, referred to as “super El Niños,” have lasting impacts that go beyond just temporary weather changes. There have only been three recorded super El Niños: 1982-83, 1997-98, and 2015-16. Each caused significant shifts in marine ecosystems, leading to severe coral reef damage and mass die-offs of various sea life.
Research indicates that super El Niños can disrupt rainfall and temperature patterns over land, especially in sensitive regions. They can create “regime-shift hotspots” in oceans that may experience lasting changes. These shifts can affect agricultural systems, making it harder for crops to thrive under new weather conditions.
One study results show that soil moisture levels in regions like East Africa and the Maritime Continent fluctuate dramatically during super El Niños. This means farmers face repeated challenges over multiple growing seasons, threatening food security in these areas.
Preparing for a Changing Climate
The potential for more intense El Niños raises serious questions about how societies, built on stable climate conditions, will cope with greater unpredictability. The U.N. recently reported that adaptation funding is lagging far behind what’s required. Developing nations may need up to $365 billion annually by 2035 to adapt to heatwaves, floods, and droughts. However, global funding currently covers less than 10% of this need.
Experts emphasize that adaptation can’t be reactive anymore. It must be strategic and transformative, focusing on redesigning infrastructure, agriculture, and cities to withstand new climate realities.
Some researchers believe that El Niño and global warming may create a feedback loop, where global warming enhances the effects of super El Niños, leading to more persistent changes in climate conditions. Kug emphasizes the importance of not just preparing for one extreme season, but for ongoing shifts that could redefine future weather patterns.
As we face these challenges, it’s clear that understanding the nuances of El Niño will be vital for mitigating its impacts. For more details, check the U.N.’s 2025 Adaptation Gap Report.
Inside Climate News is dedicated to reporting on climate issues and their impacts.
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