More than a third of the Mekong Delta in Vietnam, where nearly half of the country’s rice is grown, will be submerged if sea levels rise by 1 meter (39 inches),  environment ministry predicted.

A sea level increase of that magnitude would also inundate a quarter of Ho Chi Minh City, Vietnam’s biggest city and home to more than 6 million people, according to the extreme scenario, outlined in the newspaper Tuoi Tre .Environmental scientists have long listed Vietnam, with its lengthy coastline and vast swathes of low-lying ground, as one of the most vulnerable countries on earth to climate change.

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