Greenpeace environmental group said Thursday, March 2, 2023 that waste water discharge from Poland’s coal mines were most probably responsible for the 2022 massive fish die-off in the Oder River.

WARSAW, Poland — Poland is turning to laboratories abroad in a bid to solve the mystery of a massive fish die-off in the Oder River, authorities said Tuesday, while the government p… ...

Germany said Friday that mass fish deaths in the Oder River were a "man-made environmental disaster," blaming toxic algae growth sparked by the introduction of salt into the waters.