![](https://marsalaforla.com/wp-content/uploads/2023/08/Lake-Pontchartrain-Basin-1-1024x729.png)
![](https://marsalaforla.com/wp-content/uploads/2023/08/Lake-Pontchartrain-Algae-1-1024x707.png)
Fertilizer Runoff from upriver, especially Iowa has created a Dead Zone in the Gulf of Mexico that exceeds 9,000 square miles.
![](https://marsalaforla.com/wp-content/uploads/2020/06/florida-fish-kill-HAB-1.png)
![](https://marsalaforla.com/wp-content/uploads/2020/06/Gulf-Dead-Zone-1-1024x572.jpg)
Fertilizer Runoff from upriver, especially Iowa has created a Dead Zone in the Gulf of Mexico that exceeds 9,000 square miles.