Fedorov et al. use a coupled climate model and a hurricane model to show that hurricane activity in the central Pacific during the early Pliocene (5 to 3 million years ago), a period often taken as a close analogue to contemporary global warming, may have contributed to maintaining a permanent El Niño-like state. The larger globe on the cover shows a simulated year of early Pliocene hurricane tracks (coloured by intensity) with the sea surface coloured by temperature with ocean mixing from the hurricanes included in the simulation. The smaller globe shows a year of modern hurricane tracks, with sea temperatures, but with no hurricane-induced mixing. Cover credit: C. Brierley/Google/US Dept of State Geographer/DMapas/Europa Technologies.