NEW DELHI, Jan. 13 -- India ranks 120th out of 122 countries on the Global Water Quality Index. According to the World Economic Forum, an advocacy and non-governmental think tank based in Switzerland, water pollution is mortally affecting millions of Indians. Untreated sewage is the largest source of water pollution in India, with nearly 40 million litres entering rivers and other water bodies each day. The discharge of industrial effluents, including heavy metals and chemicals, into the ocean threatens marine life and water quality. India is also one of the largest producers of plastic waste, generating an estimated 26,000 tonnes daily. India is a hub of oil and gas exploration and transportation, increasing the risk of producing oil spi...