China and India alone will have a combined water supply shortfall of one trillion cubic metres in 2030, warned former chairman of the Central Ground Water Board SC Dhiman.
He said water shortage would emerge as the most pressing problem across the world in the next two decades.
Dhiman was addressing a two-day national seminar, Vision-2050, based on water and sustainability mining and other environment.
The seminar was organised by Indian School of Mines (ISM) in association with the ministry of earth sciences, government of India.
"By 2025, about 52 countries containing two-thirds of the global population are expected to face shortage of waterm, Dhiman said, quoting the Asian Development Bank (ADB).
He said population explosion, rapid urbanisation and rising demand for food, energy and other water-intensive goods and services would be the major cause for global water crisis.
Due to these factors, there is a huge wastage of water in the developing countries, he said.
Convener of the conference, PC Sarkar, said the primary aim of the conference was to focus on the issues related to the conservation of water against the challenge of mining.