Kolkata, the city of joy, is one of the densely populated cities in India. Situated on the banks of the Hooghly River, in the Indo-Gangetic plain, the city is home an estimated 14.1 million people. But, like most cities in India, the city of joy has a big worry — depleting groundwater. Data from the Kolkata Municipal Corporation report of 2007 shows a fall in groundwater from 11m to 7m between the years 1958 to 2003. Now, an alarming study shows that this depletion could slowly sink the city due to land subsidence. Read More at Research Matters