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A heat wave engulfing large stretches of Europe has been blamed for deadly forest fires and crop failures. Now freshwater fish could be its next victims. Temperatures are hovering near 40 degrees Celsius. It's led to rivers soaking up so much heat that the fish are beginning to suffocate. In Hamburg, authorities collected almost five metric tons of dead fish from ponds over the weekend. Firefighters have started pumping fresh water into some ponds and lakes in a bid to raise oxygen levels. Several of Germany's nuclear power stations are reducing energy output because rivers used to cool the power plants are too warm. Even the oceans have been affected. Hot weather led to the growth of toxic bacteria, which led to a swimming ban at over 50 beaches in Poland.
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