Contrary to belief that economies rebound from weather shocks, research shows El Niño systematically lowers a country's growth *trajectory*. The damage is not a one-time level effect but a persistent drag, causing economic losses to compound over time.
The severity of El Niño's impact stems from the simultaneity of disruptions across many regions. A single supply chain shock is manageable, but dozens happening at once overwhelm market forces and capital allocation, leading to a system-wide depression of growth.
The current El Niño is not just a stronger version of past events; it's occurring in a world with significant background global warming. This combination makes it a truly novel phenomenon whose consequences are harder to predict, with damages estimated near $10 trillion.
El Niño's global impact comes from spreading a massive pool of warm Pacific water across the ocean's surface. This is like turning on wall-to-wall radiators, fundamentally reconfiguring the entire planet's atmospheric heat engine, unlike more localized weather patterns.
Long before modern instruments, Peruvian potato farmers used the visibility of the Pleiades star system as a reliable indicator of an upcoming El Niño. Dimmer stars, caused by high-altitude clouds associated with the phenomenon, signaled a need to alter planting dates.
Despite El Niño being a predictable phenomenon for centuries, its ability to inflict trillions in economic damage demonstrates a widespread failure to adapt. This suggests societies are not resilient even to existing climate variability, let alone future changes.
Previous models measuring climate event costs as one-time "level effects" were vastly wrong. By accounting for the permanent depression of economic growth, the 1997-98 El Niño's five-year cost was actually $5.7 trillion, over 150 times higher than prior estimates.
Weather phenomena like El Niño are no longer niche concerns. Major banks like Citi and Morgan Stanley are incorporating its potential inflationary and currency impacts into their core economic and FX outlooks, signaling its broad market relevance.