DDT was banned because of its:

DDT, or dichlorodiphenyltrichloroethane, was banned primarily due to its stability and persistence in the environment. This chemical does not easily break down and can remain in soil and aquatic systems for many years, leading to long-term ecological impacts. Its persistence means that it can accumulate in large concentrations within the tissue of living organisms, particularly in the fatty tissues of animals, which can then lead to bioaccumulation and biomagnification in food chains.

The environmental consequences include harm to wildlife, especially birds, where DDT led to thinning eggshells and reproductive failures. These effects posed significant risks not only to individual species but also to biodiversity as a whole. Due to these concerns for environmental health and safety, the use of DDT was ultimately banned, reflecting the importance of considering the long-term ecological impact of pesticide use.