Duong Cong To checks the water of the Hau River next to his house and he is not happy at all.
“It’s too clean,” he says.
The 72-year-old has spent all his life by the river, one of two tributaries of the Mekong and the main source of alluvium for fish farms and plantations in southern Vietnam.
Over the past years he has noticed a significant change in the river: it keeps changing its color from a reddish brown to an ocean-like blue.
“The water should look red. Now it’s crystal clear like there’s nothing in there.”