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Man-made ponds may be responsible for widespread arsenic contamination of ground water affecting millions of people in Bangladesh, a new study says.

According to the journal “Nature Geoscience”, the ponds have become a dumping ground for debris which releases arsenic into ground water.

Around 25m people in the country have been exposed to arsenic through water.

Arsenic contamination of ground water is a global problem and has occurred in other countries such as Argentina, Chile, China, India, Mexico, Taiwan, Thailand and the United States.

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