New Delhi, July 16 -- The National Green Tribunal (NGT) has expressed grave concern over the increasing number of Himalayan glacial lakes and the potential threat posed by it that for catastrophic downstream floods.

The Tribunal, taking suo motu cognizance of media reports indicating a 10.81 per cent increase in glacial lakes over the past 13 years, has issued a directive to the National Institute of Hydrology (NIH) to file a detailed reply with remedial measures within four weeks.

In four page order passed by the Principal Bench, headed by Chairperson Justice Prakash Shrivastava on July 14, heard two original applications based on reports published two English dailies regarding the alarming surge of glacial lakes in Himachal Pradesh, Tib...