Activists protest logging in the Białowieża Forest in early 2017.
Poland's decisions to increase logging operations in the primeval forest of Bialowieza "are necessarily liable to result in a deterioration of the breeding sites of the protected species", the court's advocate general Yves Bot said. We are not surprised by this important legal opinion.
The Court's final ruling is expected in the coming weeks.
Poland had argued that the felling of parts of Europe's last remaining primeval forest, where 800 European bison, wolves and lynx roam across shaded clearings, was necessary as part of forest management.
In 2016, the previous minister, Jan Szyszko, authorized widespread logging in the forest, saying he was fighting an outbreak of bark beetle infestation that left dozens of hectares (hundreds of acres) of dead spruce trees. "This is the only way to properly protect it from damaging logging for good", she said. Most scientists agreed and felt that the old-growth forest should be left largely unmanaged.More news: Don't Buy that Galaxy S8 Just Yet, Price Is About to Drop
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As an interim measure, the ECJ said previous year Poland would be fined 100,000 euros ($123,610) per day if it did not stop large-scale logging in the forest.
Mr Kowalczyk said that Poland would acquaint itself with the details of the advocate general's opinion, which is not binding, but emphasised that Warsaw would abide by the Court's final ruling.
"Today's opinion should be a wake-up call to governments across the EU who are failing to comply with the EU Nature directives which protect not only Bialowieza but also many other threatened natural places and species". The opinion is not binding, but the court follows the recommendation of the advocate general in nearly all cases. Szyszko was replaced in January during a government shuffle meant to improve Warsaw's dialogue with Brussels.