Keep a look out
Why not have a look out for what other countries are doing to encourage sustainability? For example, in Germany, you may see people returning all their plastic bottles to the supermarket in order to get a small amount of money back. You may discover a creative trick that you hadn't considered before, that you can then bring back home.
Offsetting your carbon footprint
There are many websites and apps that you can use that help you calculate your carbon footprint. You can then donate trees to help offset that footprint.
Congratulations, you've done it! You've coped with all the new experiences and challenges that going abroad can throw at you. With all your new communication, problem-solving, and adaptability skills that you can add to your CV, maybe you will have come up with a new solution to the climate crisis…