How do we communicate with civilizations in the future to not eat the fish and mollusks out of the rivers. You know, the ones that are currently being contamina

How do we communicate with civilizations in the future to not eat the fish and mollusks out of the rivers. You know, the ones that are currently being contaminated with mercury and other forever chemicals from both coal ash and rare earth tailing? Please, let us know your plan. P.S. This is not a hypothetical problem, like the demands you are making of nuclear. This is a current and ongoing one. Your green energy isn't as green as you claim it is, please tell us your solution.