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Poland might have to leave the EU if it wants to apply judicial reforms, the country's supreme court has warned.
The Auschwitz Memorial asked Amazon on Sunday to take down items featured on the website that it said were inappropriate.
"We have to return to our roots. Our world has abandoned God and Christianity," Robert Bakiewicz, head of a group organising the march, told the crowd.
Final results from Poland's parliamentary election on Sunday showed the ultra-conservative Law and Justice (PiS) had won a narrow majority in parliament.
Climate change protests are becoming more frequent in Poland as public concern grows, but despite several attempts, the party has never had a politician elected to Parliament.
Earthquake injures 17 inside Polish coal mine
Masked men, armed with automatic weapons, break the windows of the Rainbow Warrior vessel.