
The pollution causing harmful algal blooms
It is the "smell of decay and death", says Beth Stauffer, from the University of Louisiana. "It has a physical presence. This layer of very striking greens and blueish greens…when you put your paddle in it, you can feel it."
She's describing the harmful algal blooms (HABs) that used to be more associated with marine environments. But in recent years they've been moving further inland and affecting freshwater systems, too. And scientists such as Stauffer are trying to find out why.