Ban harmful substances such as DDT, DDE, PCBs, toxaphene, mercury, and arsenic which are proven to biomagnify in nature.
Biological magnification is the process when the concentration of toxic substances increase with each link of the food chain. This affects us because we are at the top of the food chain.
The fact that some harmful substances aren’t biodegradable is one cause of biomagnification. Also the fact that the substances cannot be broken down internally by animals or excreted due to their water insolubility is a cause of this problem.
Concentrating on mercury, studies show that fish, birds, and mammals from aquatic ecosystems gain alarming levels of it due to human activities. It is said to be most widespread in streams, wetlands, reservoirs, and lakes.