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Study confirms arsenic deaths: Researchers from the US and Bangladesh, monitoring the arsenic intake and mortality rates of 12,000 people over the past decade, have found 20 per cent deaths were caused due to poisoning by the naturally occurring element. Nearly 90 per cent of the country’s population depends on groundwater for daily needs. Water wells in Bangladesh have exposed up to 77 million people to toxic levels of arsenic since 1970s.