Dead fishes drift in the Oder River near Brieskow-Finkenheerd, eastern Germany, on Aug. 11, 2022. 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. Greenpeace Poland also warned that the situation may reoccur this year and also hit Poland's largest river, the Vistula, if the government and the coalmining industry don't take immediate steps to counter the problem. The fish die-out was blamed on deadly algae, Prymnesium parvum, that thrive in highly salty water and in hot temperatures. (Frank Hammerschmidt/dpa via AP)
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