Greenpeace environmental group said Thursday that wastewater discharge from Poland’s coal mines was most likely 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 type of algae, Prymnesium parvum, that thrives in highly salty water and in hot temperatures.
