Ecology from unwanted environmental pollution occurs at all levels of biological organization But most information about these effects have a single species. The central or local, temporary or permanent, or short (acute) or long (chronic) the most serious effect related to the loss in production. Changes in the growth, development and / or behavioral changes. A variety or community structure, changes in the system process. (such as cycling, nutrients, and the loss of valuable species The loss of these, in turn, may be aesthetically or important social economic ecosystem.