Scientists say what is happening in Kurigram is climate change made visible, as the melting of the Himalayan glaciers that feed the Brahmaputra and Teesta rivers accelerates.

"We are seeing rapid glacial melt, almost double the rate of the 1990s. Extra water is flowing downstream, adding to the already swollen rivers," said Nishat.

At the same time, the monsoon has grown more erratic — arriving earlier, lasting longer, and falling in intense, sudden bursts. "The rhythm of the seasons has changed," Nishat said.

"When it rains, it rains too much, and when it stops, there are often droughts. This instability is making erosion and floods far worse."

He said Bangladesh contributes less than half a percent of global carbon emissions, yet suffers some of the most serious consequences of climate change.