Geography 2011A/B Lecture Notes - Lecture 3: Biomagnification, Bisphenol A, Fetus
17 Dec 2016
School
Department
Course
Professor
Document Summary
Down"s issue attention cycle: five stages, pre-problem, we are not aware of the problem, experts and government may know something is happening, alarmed discovery, (cid:862) o(cid:373)ethi(cid:374)g terri(cid:271)le is happe(cid:374)i(cid:374)g(cid:863, lake erie for example. And we have not: does not mean the problem is necessarily solved, down came up with this model in 1972. ****non-persistent and persistent are two very different kinds of pollutants **** Non-persistent pollutants: degradable, damage is reversible, can be broken down by chemical reactions or by natural bacteria into simple, non-polluting substances, examples, domestic sewage, fertilizer, some industrial wastes. As long as you do not overdo it: chicago example. People died because they were drinking poo infested water. It was being dumped at too fast of a pace. Eutrophication and oxygen depletion: biological productivity, the amount of living material supported within a lake. Intermediate productivity: mesotrophic, tends to be rivers, lakes and streams, most productive, eutrophic.
