Científicos proponen 5 medidas urgentes para preparar al mundo ante un Súper El Niño

A group of climate scientists from the University of Bristol has published a stark warning in The Lancet: the world has a narrow window to prepare for what could be a severe El Niño event by late 2026, and governments are not moving fast enough. The phenomenon—an anomalous warming of surface waters in the equatorial Pacific—reshapes rainfall patterns and temperatures across continents thousands of miles away. In some regions it brings torrential rains and floods; in others, it triggers droughts, scorching heat, and crop failures. The researchers are not simply predicting meteorological disruption. They are mapping a cascade of health consequences: the spread of mosquito-borne diseases, malnutrition, dehydration, heat stroke, and the collapse of medical systems in countries least equipped to respond.

The proposal, led by Ruby Lieber, an associate researcher in climate science at Bristol, and Dann Mitchell, who holds the Shanta Chair in Planetary Health at the same institution, argues that El Niño's predictability is both a gift and an indictment. Because scientists can see it coming months in advance, there is no excuse for being caught unprepared. Yet the current approach treats El Niño as a meteorological event to be monitored by weather agencies and environmental ministries—a technical forecast, not a public health emergency. The researchers want that to change. They want the United Nations to declare El Niño officially, not as a notice for specialists, but as a signal for coordinated global action. That declaration should trigger the mobilization of resources, information, and assistance toward the countries facing the greatest risk.

The five recommendations they outline are practical and interconnected. First, the UN and other international bodies must activate health prevention measures the moment El Niño is officially declared. This means preparing disease prevention campaigns, identifying flood-prone zones, strengthening water and food supplies, and bracing health services for the surge in demand they will face. Second, governments need support to assess how El Niño will affect their populations specifically and to activate early warning systems—networks that can alert people to intense rainfall, flooding, extreme heat, or water scarcity with enough lead time to evacuate, reinforce hospitals, or communicate protective measures. This requires breaking down silos: climate forecasters must work directly with health ministries, emergency services, local authorities, water and sanitation networks, and food production agencies.

Third, researchers must expand studies that distinguish El Niño's impact from the impact of human-caused climate change. Lieber acknowledged that the number of people affected by climate disasters is heavily tied to El Niño cycles, yet there is still insufficient data to determine precisely what portion of health burden comes from the phenomenon itself and what from warming driven by greenhouse gas emissions. The distinction matters practically. A territory facing floods needs different interventions than one facing drought and heat. Understanding the specific cause allows authorities to design responses tailored to local needs—drainage infrastructure and disease surveillance for one place, water reserves and heat protection plans for another.

Fourth, health consequences must be monitored continuously throughout El Niño's evolution, not analyzed only after it ends. Temperature and rainfall shifts can accelerate the spread of vector-borne diseases, compromise food security, restrict access to clean water, and increase heat-related illness. Because the intensity of these impacts depends on local conditions—the strength of hospitals, the quality of housing, economic stability—monitoring requires real-time data from health systems, climate networks, food availability, and public service capacity. Fifth, countries must evaluate which prevention and response measures deliver the most protection per dollar spent. Early warning systems, hospital capacity building, urban flood defenses, and policies to strengthen food system resilience all require investment that vulnerable economies struggle to afford. The researchers are calling for international coordination among climate scientists, health researchers, funders, the World Health Organization, the UN system, the World Bank, and NGOs—with support arriving before crisis forces response with inadequate resources.

The core argument is simple: El Niño offers a window of anticipation that most disasters do not. The world knows it is coming. The world knows what it can do. The only question is whether governments will act before the emergency arrives.