Sustainability Story Ideas on Amsterdam Rivers or Oceans

Hallo. Now my sublet is confirmed, it's not long before I'll be heading to Amsterdam soon for a month. While I'm there, I'll be looking for sustainability-related stories to write about. Within this I'm keen to hear of any ideas related to river/sea/ocean (for example, I previously covered the trend of cargo sailing boats). Please DM me or add ideas below. ps I'm running my How to Secure Media Coverage workshop at the wonderful co-working space Equals. Will add a link below. #journorequest