No offense, but why do you think you can come up with a solution after thinking about a problem for maybe 10 seconds, when tons of smart people are working on this problem and can&#x27;t come up with a great solution?<p>The problem with fertilizer run off is that it penetrates the ground, travels very slowly, and leeches into waterways. Once the fertilizer and contaminants are in the soil, they move <i>very</i> slowly. Like a meter or two per year. So, right now, we are seeing fertilizer and contaminant runoff entering streams, because a farmer in the 1970s fertilized a field that was 50 meters away from a river. I don&#x27;t think we have a time machine available to go back and tell them to not fertilize their fields, which is basically the only way your solution would work.<p>The other alternative is to wait it out, but the coral reefs will be gone by then, because they will have been devoured by the sea stars.