Super El Niño threatens to unleash one of the most destructive Seasons

THE 592 GUARDIAN ◊ ACCOUNTABILITY JOURNALISM ◊ FOR GUYANA

Super El Niño threatens to unleash one of the most destructive Seasons

As a Super El Niño threatens to unleash one of the most destructive seasons in recent memory, a provocative scientific paper asks a difficult question: if we can’t stop the planet from warming fast enough, should we consider temporarily dimming the sun to blunt the worst impacts?

A team at Scripps Institution of Oceanography used climate models — and lessons from the 2019–20 Australian “Black Summer” fires — to test whether marine cloud brightening, a form of solar geoengineering, could tamp down a powerful El Niño. The idea is simple in concept and fiendishly complex in execution: spray sea-salt aerosols into low ocean clouds so they reflect more sunlight, cool the tropical Pacific, and reduce the spike in global temperatures that a Super El Niño would bring.

Their models show it might work — at least partially. Targeted cloud brightening applied early could shave roughly 40 percent off peak El Niño warming in the simulations. That could translate into fewer heatwaves, smaller wildfires, reduced crop failures, and less pressure on overstretched health and emergency systems. For regions like the Caribbean and Guyana, where livelihoods depend on stable rainy seasons, fisheries and agriculture, and where disasters quickly overwhelm limited response capacity, any tool that lowers immediate harm is tempting.

But temptation is not policy. The paper is a proof of concept, not a policy prescription — and for good reason. The gulf between a model result and a safe, effective technology is vast. Engineers currently lack sprayers capable of delivering the right quantity and size of particles over the required ocean areas. Models still struggle to predict the cascading, remote effects of changing cloud reflectivity on global rainfall patterns. And there is real risk of overcorrection: a “too strong” intervention could trigger a mega La Niña with its own catalogue of floods, storms and agricultural disruption.

Beyond technical uncertainty lie profound ethical and geopolitical questions. Who decides to dim the sun for months or years? A handful of wealthy states, private funders, or an international process that includes the most vulnerable voices? The distributional stakes are enormous: a change that reduces heat in one place might reduce rain in another, hitting small island states, farmers, or urban poor who already carry the heaviest climate burdens. Then there’s the moral hazard: the more credible a techno-fix becomes, the more it risks blunting the political urgency to cut greenhouse gas emissions — the only durable solution to the climate crisis.

So what should policymakers, civil society and the public in the Caribbean and Guyana take from this study? First: don’t be distracted. Geoengineering research must be watched, regulated and debated transparently, but it is not a substitute for rapid emissions cuts or for costly, necessary adaptation. Second: demand a voice. Any international discussion of geoengineering governance must include the countries most at risk. We cannot allow decisions about global sunlight to be taken behind closed doors by institutions or corporations with little stake in our futures. Third: invest in readiness. Whether or not marine cloud brightening ever becomes viable, this decade will bring some of the highest-stakes weather in living memory. Strengthening water management, resilient agriculture, early-warning systems and health infrastructure is non-negotiable.

Finally, treat this science as what it is: an alarm bell. The study underlines a brutal truth — climate change is not a gradual nuisance; it is pushing natural systems like El Niño into new, more dangerous regimes. If a high-tech intervention is even being discussed as a possible emergency tool, that is evidence of failure, not ingenuity. Our response should be proportionate: accelerate deep emissions cuts, fund adaptation where lives and livelihoods hang in the balance, and build inclusive, binding governance for any research into planetary-scale interventions.

We cannot let the lure of a quick technical fix derail our political will. The choice before us is stark: commit to the long, difficult work of decarbonisation and resilience now, or gamble with untested manipulations of the very system that sustains life on Earth.

THE 592 GUARDIAN — EDITORIAL BOARD, JULY 2026