Editing Halocarbon (section)

=== Natural halocarbons ===
A large amount of the naturally occurring halocarbons, such as [[Dioxins and dioxin-like compounds|dioxins]], are created by wood fire and [[Volcanism|volcanic activity]]. A third major source is marine algae, which produce several chlorinated [[methane]] and [[ethane]] containing compounds. Several thousand complex halocarbons are known to be produced mainly by marine species. Although chlorine compounds are the majority of the discovered compounds, bromides, iodides and fluorides have also been found in nature. [[Tyrian purple]] is a bromide and is produced by certain sea snails. [[Thyroxine]] is secreted by the [[thyroid gland]] and is an iodide. The highly toxic [[Fluoroacetic acid|fluoroacetate]] is one of the rare natural organofluorides and is produced by certain plants.<ref name="Gribble98">{{Citation
 | title = Naturally Occurring Organohalogen Compounds
 | author = Gordon W. Gribble
 | journal = [[Acc. Chem. Res.]]
 | volume = 31 | issue = 3 | pages = 141–152
 | year = 1998 | doi = 10.1021/ar9701777
}}.</ref><ref name="Gribble99">{{Citation
 | title = The diversity of naturally occurring organobromine compounds
 | author = Gordon W. Gribble
 | journal = [[Chemical Society Reviews]]
 | volume = 28 | issue = 5 | pages = 335–346
 | year = 1999 | doi = 10.1039/a900201d
}}.</ref><ref name="Gribble02">{{Citation
 | title = Naturally Occurring Organofluorines
 | editor1-first = A. H. | editor1-last = Neilson
 | author = Gordon W. Gribble
 | journal = Organofluorines
 | series = The Handbook of Environmental Chemistry | volume = 3n | pages = 121–136
 | year = 2002 | doi = 10.1007/10721878
| isbn = 3-540-42064-9 }}.</ref>