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Oder River mass fish deaths on German-Polish border linked to mercury

Oder River mass fish deaths on German-Polish border linked to mercury

Poland says the Oder River disaster could have been caused by an intentional dumping of chemicals, although scientists say climate change may have had a role.
Hundreds of lakes in U.S., Europe are losing oxygen

Hundreds of lakes in U.S., Europe are losing oxygen

Oxygen levels have dropped in hundreds of lakes in the United States and Europe over the last four decades, a new study found.

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