The problem is caused by too many nutrients entering the water, typically nitrogen and phosphorus from artificial fertilisers. These are carried into the sea by the rivers of the surrounding countries – Denmark, Estonia, Finland, Germany, Latvia, Lithuania, Poland, Russia and Sweden.
Algae that blights our seas is harvested to make useful products
![Algae-that-blights-our-seas-is-harvested-to-make-useful-products](https://www.rocketnews.com/wp-content/uploads/2023/01/Algae-that-blights-our-seas-is-harvested-to-make-useful-products.jpg)