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One-fifth of the world’s corals have died and many remaining reefs may be lost by 2050 as carbon dioxide from cars and pollution-spewing industries make ocean water warmer and more acidic, the Global Coral Reef Monitoring Network said.

The fate of corals is crucial to the livelihoods of millions of coastal dwellers around the world. Reefs are worth about $30 billion a year to the global economy through tourism, fisheries and coastal protection, according to the Millennium Ecosystem Assessment, a United Nations-supervised study.