New Delhi, July 6 -- As we watch the horrific heat stress unfolding across Europe, with water jets and public pools helping cool residents, one reality becomes impossible to ignore: heatwaves always increase the demand for water. What if heat stress of this scale and intensity were to unfold in India? Would we have the water resources to cope? A report by the Indian think tank Council on Energy, Environment and Water (CEEW) suggests that 11 of India's 15 river basins are approaching severe water-deficient levels, potentially leaving 600 million people under high water stress. Water percolation is one way to alleviate this, as India relies on groundwater more than any other country for agriculture and drinking water. But another reality comp...