The natural burst of El Niño warming that changes weather worldwide is far costlier with longer-lasting expenses than experts had thought, averaging trillions of dollars in damage, a new study found.

An El Niño is brewing now and it might be a big — and therefore costly — one, scientists said. El Niño is a temporary and natural warming of parts of the equatorial Pacific, that causes droughts, floods and heat waves in different parts of the world. It also adds an extra boost to human-caused warming.