There are a few eco-friendly options to consider for traveling from Gdańsk to Denmark:

Train: Taking a train is generally considered to be one of the most eco-friendly ways to travel. There are several train companies that operate between Gdańsk and Denmark, such as DSB and Deutsche Bahn. Depending on the specific route and train you take, the journey could take anywhere from 5 to 10 hours, with a change of trains in either Hamburg or Copenhagen.

Ferry: If you're looking for a more scenic route, taking a ferry from Gdańsk to Denmark could be a good option. There are several ferry companies that operate between Poland and Denmark, such as Stena Line and Polferries. Ferries produce lower emissions per passenger than planes, and the journey can be a fun and relaxing way to see the coastline.

Bus: Taking a bus that uses alternative fuels, such as electric or hybrid buses, could also be an eco-friendly option. Companies like FlixBus and Eurolines operate bus routes between Gdańsk and Denmark, and they may offer eco-friendly options.

Overall, taking a train or a ferry would be the most eco-friendly options for traveling from Gdańsk to Denmark. However, it's worth checking with the individual companies to see if they offer any specific eco-friendly options, and to compare the emissions associated with each mode of transport to make an informed decision.
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