Global Warming Intensifies El Niño, Galápagos Coral Fossils Show

The Galápagos corals have been keeping a secret, and now they've told it. For decades, climate scientists have wrestled with a crucial question: is the recent volatility of El Niño a product of natural variability, or are we forcing the system? This new study, published in *Science* and covered by Inside Climate News, answers that question with chilling clarity. The coral skeletons, which act as natural thermometers preserving sea surface temperature records over centuries, show that the past four decades of El Niño-Southern Oscillation (ENSO) activity are statistically distinct from the prior 1,000 years. We have crossed a threshold, and the corals are the witnesses. What makes this finding so significant is that it moves us from theoretical modeling to empirical evidence. Climate models have long predicted that a warming planet would amplify ENSO extremes, but the natural noise of the climate system has made it difficult to separate the signal from the background. The Galápagos corals, sitting at the epicenter of ENSO dynamics in the eastern tropical Pacific, provide a high-resolution archive that cuts through that noise. The sharp swings in sea surface temperature they record are not just numbers on a graph; they represent the physical mechanism behind devastating floods in Peru, megadroughts in Australia, and disruptive global weather patterns. The implications of this intensification ripple far beyond the scientific community. Every El Niño is now a potential rehearsal for the next, more extreme one. The 2023-2024 El Niño, which contributed to record global heat and coral bleaching, may be a preview of the "new normal." For vulnerable communities, this means more frequent and severe climate shocks, straining food systems, water supplies, and disaster response infrastructure. Governments and international bodies cannot treat El Niño as a cyclical event to be weathered; they must treat it as an escalating hazard that demands proactive adaptation. This research also underscores the critical importance of long-term, place-based scientific observation. The Galápagos, made famous by Darwin, continue to offer profound insights into the mechanics of life and climate. As we push the planet further out of its natural equilibrium, these sentinel ecosystems become even more valuable—not just for their biodiversity, but for the records they hold of a changing Earth. The corals have given us a clear message: the climate system is responding to our actions, and the consequences are already upon us. The question is whether we will read the message in time to act. *Source: [Inside Climate News](https://insideclimatenews.org/news/27082026/global-warming-intensifies-el-nino/)*