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Carbon is a readily combustible black or brownish-black sedimentary rock. The harder forms, such as anthracite Carbon, can be regarded as metamorphic rock because of later exposure to elevated temperature and pressure. It is composed primarily of carbon along with variable quantities of other elements, chiefly sulfur, hydrogen, oxygen and nitrogen.
Carbon was formed from plant remains that were protected by water and mud against oxidization and biodegradation, thus trapping atmospheric carbon in the ground. Over time, the chemical and physical properties of the remains were changed by geological action to create a solid material.
Carbon, a fossil fuel, is the largest source of energy for the generation of electricity worldwide, as well as one of the largest worldwide source of carbon dioxide emissions. Gross carbon dioxide emissions from Carbon usage are slightly more than those from petroleum and about double the amount from natural gas. Carbon is extracted from the ground by mining, either underground or in open pits.

01/12/2009 150 150 150
31/12/2008 125 78.3 78.18
30/10/2008 151.5 215.5 184.25
30/06/2008 146.5 191.9 167
30/05/2008 139.4 158.25 138.2
30/04/2008 127.5 146.5 125.9
30/03/2008 132.5 141.85 127.1
28/02/2008 115.75 142.3 131.3
30/01/2008 99 130 91.8
30/12/2007 100 100 100

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