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This photo taken on March 19, 2015 shows a Bangladeshi woman collecting contaminated water, to be put over produce at a vegetable market, from the polluted Buriganga in Dhaka. A new UN report launched in New Delhi on March 20 ahead of World Water Day on March 22 warned of an urgent need to manage the world's water more sustainably and highlight the problem of groundwater over-extraction, particularly in India and China. The report says global demand for water is increasing exponentially, driven largely by population growth. AFP PHOTO/ Munir uz ZAMAN (Photo credit should read MUNIR UZ ZAMAN/AFP/Getty Images)

This photo taken on March 19, 2015 shows a Bangladeshi woman collecting contaminated water, to be put over produce at a vegetable market, from the polluted Buriganga in Dhaka. A new UN report launched in New Delhi on March 20 ahead of World Water Day on March 22 warned of an urgent need to manage the world's water more sustainably and highlight the problem of groundwater over-extraction, particularly in India and China. The report says global demand for water is increasing exponentially, driven largely by population growth. AFP PHOTO/ Munir uz ZAMAN        (Photo credit should read MUNIR UZ ZAMAN/AFP/Getty Images)