It sneaks out oil and fills Russia's war coffers. It is suspected of spying on Sweden. And it is feared that at any time it...
Text: Martin Mederyd Hårdh/TT
Photo: Dmitri Lovetsky/AP/TT
Algal blooms in the Baltic Sea are fertilized by nutrient releases. Emissions have been successfully combated in recent years. But – are vital cyanobacteria threatened by the fight against eutrophication and bottom death?