Until 1997, few people had heard of the seasonal current that Peruvians nicknamed El Ni o. But when meteorologists linked it to devastating floods in California, severe droughts in Indonesia, and strange weather everywhere, its name became entrenched in the common parlance faster than a typhoon making landfall. Bumper stickers appeared bearing the phrase "Don't blame me; blame El Ni o." Stockbrokers muttered "El Ni o" when the market became erratic...