The El Niño Effect: Separating Signal from Noise in a Warming World

The prospect of a “super” El Niño brewing this summer has sparked concerns about its potential impact on global weather patterns. Climate models suggest that an unusually strong El Niño is possible, but the actual effects are far more complex than rising temperatures and extreme weather.

One key aspect to consider is the distinction between natural variability and long-term trends. El Niño events have always occurred within the larger context of global warming, but increasing greenhouse gas emissions have pushed the planet’s climate beyond its previous limits. This means that even moderate El Niño events are now compounded by human-caused climate change.

According to Professor Kent Moore of the University of Toronto, the biggest impacts in Canada tend to occur during the winter months, when Eastern and Central provinces experience warm winters. Past El Niño events, such as the 2015-2016 super El Niño, have had significant temperature anomalies in the Niño 3.4 region.

However, these effects are not solely due to El Niño itself but rather the cumulative impact of rising temperatures on global weather patterns. Climate scientist Friederike Otto notes that climate change is “the reason to freak out,” while El Niño is merely a symptom of an underlying problem.

The 2026-2027 winter season is expected to be particularly significant, with many scientists predicting record-breaking temperatures and unprecedented weather extremes. In this context, the potential for a strong El Niño event only amplifies existing trends rather than driving them.

In fact, many climate-related impacts in recent years have been driven by human activities rather than natural variability. The 2020 and 2021 La Niña events were accompanied by record-breaking temperatures despite expected cooling effects.

Strong El Niños have historically led to increased wildfire risk in Western Canada and the northwest United States, but this trend is not solely driven by climate variability – it’s a result of compounding human-caused climate change. As fossil fuel emissions continue at alarming rates, the consequences of our actions are becoming increasingly evident.

Record-high burned areas from wildfires, unprecedented heat waves in the U.S., and a global increase in extreme weather events all point to a pressing need for action on climate change. The El Niño effect is not a reason to panic but an opportunity to highlight the urgent need for climate mitigation.

We have the knowledge and technology to significantly reduce our reliance on fossil fuels, as Professor Otto emphasized. The question remains: will we take the necessary steps to address this crisis before it’s too late?