Dhaka, April 7 -- Environment Advisor Syeda Rizwana Hasan has cautioned that the future impacts of climate change could require Bangladesh to redraw its national boundaries.

Speaking at a session at the Defence Services Command and Staff College in Dhaka, she highlighted that climate change now poses a "deep" threat to the country's national security, territorial integrity, and social stability.

Rizwana warned that a rise in sea levels, coastal erosion, and climate-induced displacement might force Bangladesh to redraw its map in the next few decades.

Her concern was evident as she pointed out that a one-metre rise in sea levels by mid-century could submerge 21 coastal districts.

"Millions will become homeless," the advisor said. "Salt...