El Niño has strengthened in the last 40 years to a level not seen in the thousand years before industrialization

An analysis of living and fossil corals from the Galapagos Islands found that the variability of the El Niño–La Niña system in the eastern Pacific Ocean is now 36.5% higher than it was during the pre-industrial millennium. The increase is largely due to stronger and more frequent El Niño events, and natural climate models alone have failed to reproduce a change of this magnitude.