Chlorinated organics, such as dioxin, are produced through natural as well as man made processes. Significant amounts of dioxin are produced by nature in peat bogs, during volcanic eruptions, from forest fires, or wherever compounds containing hydrogen, carbon and chlorine are burned. Forest fires may be the single largest source of dioxin in the environment. Not only does nature produce chlorinated organics, it also destroys them. Many types of bacteria can destroy chlorinated organics present a few inches under the ground, where air is not available.
Elements are the building blocks of the universe.
There are only 109 known elements. Thus, only 77 elements can be used to make compounds we depend on. Only 16 elements make up 99.5 percent of the earth's crust, including air and water, and chlorine is the eleventh most abundant. 310A-317A. Hawk, Philip B., Ph.D, Oser, Bernard L., Ph.D., and Summerson, William, Ph.D., Practical Physiological Chemistry , Thirteenth Edition. Hawley, Condensed Chemical Dictionary , Revised by N. Irving Sax and Richard J. Lewis, Sr., New York, Van Nostrand Reinhold Company, 1987.