Guardian: Earth system science is shorthand for the recognition that El Niño, climate change and the calamitous 2004 tsunami are all very complex events. El Niño is a natural cyclic blister of hot water in the Pacific that ruins the anchovy harvest off the coast of Peru. It also disturbs weather patterns to trigger floods on the western coasts of the Americas, stoke droughts and forest fires in Indonesia, and blight harvests in Africa. Human complicity in dangerous climate change is now …