Arsenic in drinking water is a global threat to health, affecting more than 70 countries and 137 million people, according to new research. Large numbers of people are unknowingly exposed to unsafe levels of arsenic in their drinking water, said Peter Ravenscroft, of the Department of Geography at the University of Cambridge. He made his remarks at an annual conference of the Royal Geographical Society in London. The country worst affected is Bangladesh, where hundreds of thousands of people are likely to die from cancers of the lung, bladder and skin caused by arsenic, the research said.

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