In terms of eco-friendliness, the most sustainable option for traveling from Gdańsk to Denmark would be to take a train or bus, as they generally have lower carbon emissions compared to airplanes or cars.

For train travel, you can take a train from Gdańsk to Copenhagen, which takes about 10-11 hours with a transfer in Hamburg, Germany. You can also take a ferry from Gdańsk to Nynäshamn, Sweden, and then take a train or bus to Copenhagen, which would take about 20-25 hours. Alternatively, you can take a bus from Gdańsk to Copenhagen, which would take about 12-13 hours with a transfer in Berlin, Germany.

Keep in mind that the carbon footprint of any mode of transportation can vary depending on factors such as the type of fuel used, the efficiency of the vehicle, and the number of passengers. If you want to minimize your environmental impact, you can also consider taking direct routes, traveling during off-peak hours, and using public transportation or bike-sharing options once you arrive at your destination.
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