Answer:
Reduce farm fertilizer runoff
Explanation:
The Mississippi River is an extremely important waterway. The watershed that drains into the river covers about 41 percent of the United States. That is about the size of 600 million football fields. Much of this land is in regions where farming takes place. Fertilizer use leads to excessive nitrogen and phosphorus runoff. The runoff ends up draining into the Mississippi River, which drains into the Gulf of Mexico. Edge 2021
