That is why it is so difficult to stop the spread of chemicals

Play the clip above.

Read more about bisphenols here, and the new chemical investigation is here.

Want to know more about toxins in the Baltic Sea and how its conditions have changed over the last ten years, see the Baltic Sea program - threats and hope, in the Science of the World on Monday 25 November in SVT2, at. 20:00. The program can also be viewed on SVT Play.