Mysterious mass fish kill in River Oder: Climate change or poison?

Thousands more dead fish have been discovered in the Oder River that borders Germany and Poland, this time in the vicinity of the eastern city of Frankfurt (Oder). Local authorities have warned residents, along with their pets and livestock, not to touch the river water.

The exact cause of the mass fish kill, also reported upstream around two weeks ago, remains unclear.

At the end of July, Polish anglers reported removing tons of dead fish from the Oder near the town of Olawa, about 300…