1) The document discusses various topics related to managing the Danube River, including a hydroelectric power plant that took 12 years to build and provides electricity for millions, the responsibilities of Viadonau which include docks, cycle tracks and 15,000 hectares of real estate, and its duties related to resources, transport, recreation, habitat and navigation. 2) It also covers issues like the increased usage of plastic between 1980-2017 which can take 100-500 years to decompose, with 80% of ocean plastic coming from rivers, and how plastic ends up in fish that are eaten. 3) Additional topics include sediments which are solid materials moved and deposited elsewhere, with 65 animal species found in the