El Niño Doesn’t Explain Away Global Warming. It Amplifies It.

The Bureau of Meteorology has officially declared an El Niño, and the ABC is reporting that it could become one of the strongest events in the modern era. The tropical Pacific is warming, the Southern Oscillation Index has plunged, trade winds have weakened, and models are pointing to a very strong event. For once, a climate story is sitting right at the top of the national news. That doesn’t happen often enough, so it is worth paying attention.

But it also means we can expect the usual nonsense. Climate deniers will point to El Niño and say, “See? It’s not global warming. It’s just natural.” They will say it as if El Niño somehow explains away rising global temperatures, bleaching reefs, hotter oceans, longer fire seasons and record-breaking heat. They will use a real climate pattern as an excuse to ignore the bigger climate system it now operates inside.

That's the trick. Yes, El Niño is real. It matters. It has always mattered. But it is not an alibi for global warming. Actually, it's one of the ways global warming now shows up.

El Niño happens when waters in the central and eastern tropical Pacific become warmer than usual. That change affects winds, pressure systems, cloud, rainfall and temperatures around the world. In Australia, El Niño has traditionally been associated with hotter days, reduced rainfall and drought across parts of eastern and southern Australia, weaker snow seasons, and more dangerous fire weather. The important point is that El Niño is an observation, not a weather forecast for every part of Australia.

But none of this changes the central point. El Niño is no longer happening in the climate of the 1950s, 1970s or even the 1990s. It's happening in a hotter world. And that changes the stakes.

Think of it like a bushfire. A spark matters. Wind matters. The slope matters. But the condition of the forest matters too. A spark in a damp forest is one thing. A spark in a hot, dry forest after years of rising temperatures is another. El Niño is the spark. Global warming is the hotter, drier forest.

That's why “it’s El Niño” is such a dishonest answer when people use it to dismiss climate change. El Niño can help push a hot year into record territory, but global warming is why the baseline keeps rising. El Niño can shift heat around the planet, but global warming is adding more heat to the whole system. El Niño can increase the risk of heatwaves, drought and fire weather, but climate change makes those risks more dangerous because the land, oceans and atmosphere are already warmer than they used to be.

This is the bit the denialists always leave out. Natural variability hasn't stopped. Seasons still change. El Niño and La Niña still happen. Droughts and floods still have natural drivers. But those natural drivers are now operating on steriods - in a climate system that humans have radically changed. More greenhouse gasses trap more heat. More heat warms the oceans. Warmer oceans feed more extreme weather. Hotter air dries landscapes faster and holds more moisture when rain does fall. That's not ideology. It is physics.

So when someone says, “It’s just El Niño,” the answer is simple: no, it's El Niño in a globally warmed world. Not El Niño instead of climate change. El Niño plus climate change. Natural variability plus human-caused warming. A climate pattern riding on top of a hotter baseline.

For Australia, this matters deeply. A strong El Niño in a warming world means more pressure on farmers, rivers, wildlife, emergency services and communities living with bushfire risk. It means more heat stress for people working outside, older people, children and people who cannot afford to keep their homes cool. It means more pressure on alpine ecosystems, coral reefs, threatened species and Country itself.

It also means we need to be honest about what's happening. We're not just unlucky. We're not just living through a cycle. We're not waiting for the weather to “go back to normal”. The old normal is gone, because we have changed the conditions.

El Niño doesn't explain away global warming. It actually shows how global warming works in the real world. Climate change doesn't develop as a simple straight line. It comes through the systems we already know: oceans, winds, droughts, floods, fires, heatwaves and seasons. It loads the dice. It raises the floor. It turns natural events into more dangerous events.

So El Niño isn't an excuse to stop talking about climate change. It's a reason to talk about it even more clearly. Because the real story is not that the Pacific is warming for a few months. The real story is that the whole planet has been warming for decades, and the bill is now arriving through our weather.

Image from NOAA.