A Historic El Niño Is Coming That Could Cost the World Trillions

Episode Summary

Executive Summary: The episode explains El Niño as a measurable ocean-atmosphere pattern that reshapes global weather and can create major economic losses through simultaneous shocks to agriculture, infrastructure, trade, and prices worldwide. Guest Justin Mankin argues these impacts are not merely temporary disruptions but can depress long-run growth, with the coming event potentially record-breaking amid global warming.

Main Topics: What El Niño is and how it works (Priority: 5/5): Mankin explains El Niño/ENSO as a coupled ocean-atmosphere phenomenon in the tropical Pacific driven by weakened trade winds, eastward sloshing of warm water, and sea-surface temperature anomalies that alter global weather. Forecasting a potentially record-breaking event (Priority: 5/5): The hosts discuss how forecasts from multiple models and institutions point to an unusually strong upcoming El Niño, with analysts and central banks starting to incorporate it into economic outlooks. Measuring and defining El Niño (Priority: 4/5): The conversation covers the technical indices used to track El Niño, including regional Niño temperature bands and the E-index, and why different spatial patterns lead to different impacts. Historical and cultural knowledge of El Niño (Priority: 4/5): Mankin highlights archaeological evidence that Peruvian farmers used Pleiades visibility to anticipate El Niño centuries ago, showing that local knowledge long predated modern instrumentation. Economic costs and growth effects (Priority: 5/5): A central theme is the Science paper finding El Niño can reduce economic growth, not just cause a one-time output hit, implying losses can accumulate over time rather than fully reverse. Adaptation, resilience, and climate change (Priority: 5/5): The discussion connects El Niño to broader climate-change risk, arguing there is limited evidence that economies are fully adapted and that better early warning, infrastructure, insurance, and market resilience are needed.

Key Arguments: El Niño is a real, measurable ocean-atmosphere phenomenon, not just a vague weather label; it can be tracked through sea-surface temperature anomalies and physical circulation changes. Its importance comes from global simultaneity: many regions experience hazards at once, which can compound into macroeconomic damage through supply chains, commodities, and investment channels. The event’s effects are not purely short-term level shocks; Mankin argues they can systematically depress growth, meaning losses may persist for years. Record strength is judged by temperature anomalies relative to a baseline, but the choice of baseline matters because the ocean is warming under climate change. El Niño forecasting is valuable because it gives societies lead time to adapt through planting decisions, emergency planning, and financial risk management. There is limited evidence that the global economy is well adapted to El Niño or broader climate variability, despite centuries of exposure. Global warming likely makes the current El Niño more consequential by adding heat on top of an already warming baseline, increasing the odds of extreme annual temperatures and larger losses.

Data Points: Potential current forecast threshold: 3.3 - The Australian Bureau of Meteorology’s Relative Oceanic Niño Index was described as projected to exceed this level, which had not happened before. Advisory start: June - NOAA’s Climate Prediction Center was cited as having issued an El Niño advisory since June. Peak timing: December-January-February - Mankin noted El Niño typically peaks in boreal winter. Wind/planting adaptation history: 500 years ago - Peruvian farmers were cited as having forecast El Niño centuries ago using Pleiades visibility. Great famine event: 1877-1878 - Mentioned as an historically severe El Niño associated with famines. Notable past events: 1982-83, 1997-98, 2015-16 - Cited as major historical El Niño episodes, with 2015-16 described as the strongest on record depending on index. Estimated 1997-98 losses: $36 billion - Presented as the contemporaneous estimate of economic losses from that event. Five-year global losses from 1997-98: $5.7 trillion - Mankin’s research estimated cumulative losses by 2003 when accounting for depressed growth trajectories. Prospective 5-year losses from current event: $10 trillion to $14 trillion - Mankin gave a conservative estimate of future global economic losses from the unfolding El Niño. Share of losses supported by existing data: 70% - He said about 70% of the $10 trillion estimate is in-sample, supported by observed data. Warm year risk: 2026 and 2027 - He said 2026 has a non-trivial chance of being the warmest year on record and 2027 is nearly locked in for a record temperature. Expected end of event: February-March 2027 - The event was described as winding down around this period.

Pivotal Quotes: "It really is not about them. It is about the organization. About how to lead in the age of AI." — Promotional intro: Opening promo clip at the beginning of the transcript, unrelated to the main El Niño discussion. "The tropics are the heat engine of global weather and climate, and it's a complete reconfiguration." — Justin Mankin: Explaining why El Niño has global impacts beyond the tropical Pacific. "We can detect very sizable deviations in economic growth from El Nino as a phenomenon." — Justin Mankin: Summarizing the core empirical finding from his research on macroeconomic effects.

Implications: Listeners should expect El Niño to affect food prices, infrastructure, markets, and regional politics, especially as climate change raises the stakes. Businesses and governments may need better forecasting, emergency planning, and resilience investments rather than assuming a quick rebound.