What does a persistent bloom of algae indicate about the health of the planet?

https://phys.org/news/2018-11-persistent-bloom-algae-health-planet.html

While the harmful algae known as red tide have historically been common in warm waters like those of the Gulf of Mexico, the troublesome blooms are no longer seasonal. The algae kill marine animals and make life miserable for beachgoers.


Original Title: What does a persistent bloom of algae indicate about the health of the planet?
Full Text of the Original Article: https://phys.org/news/2018-11-persistent-bloom-algae-health-planet.html