El Niño raises global heat risks as study projects 451,000 deaths

What This is

• A new report estimates a record “super El Niño” could lead to about 451,000 excess heat-related deaths worldwide from June 2026 to February 2027.
• The estimate links El Niño to a roughly 44% increase in extremely hot days during that period, compared with what would otherwise occur.
• The report says human-driven global warming would amplify El Niño’s heat, making dangerous temperatures more likely and more intense.
• It projects some of the worst impacts in parts of the Global South, including Nigeria, Indonesia, and Sudan.
• The report also flags large projected death tolls in India and Brazil, and projects about 3,500 excess deaths in the US.
• The study was released before peer review, but it uses peer-reviewed methods and estimates across more than 24,000 regions.
• Researchers recommend targeted emergency measures such as heat warnings and access to cooling to reduce deaths during extreme heat.

Why This Matters

• It frames extreme heat as a predictable public-health threat requiring government planning, rather than just “bad weather”.
• It highlights how natural climate cycles, such as El Niño, compound human-caused warming to push temperatures into dangerous ranges.
• It raises equity concerns, as the highest projected death tolls are in regions with limited access to cooling, health care, and heat alerts.
• Despite being a forecast rather than a confirmed death toll, the estimate could spur proactive investments in heat action plans and worker protections.