Carbon the very large masses of carbonate rock (limestone, dolomite, marble and so on). Coal is very rich in carbon (anthracite contains 92–98%) and is the largest commercial source of mineral carbon, accounting for 4,000 gigatonnes or 80% of fossil fuel. As for individual carbon allotropes, graphite is found in large quantities in the United States (mostly in New York and Texas), Russia, Mexico, Greenland, and India. Natural diamonds occur in the rock kimberlite, found in ancient volcanic "necks", or "pipes". Most diamond deposits are in Africa, notably in South Africa, Namibia, Botswana, the Republic of the Congo, and Sierra Leone.
The Carbon Principles The Carbon Principles The Carbon Principles are a series of guidelines established by three leading Wall Street banks — Citigroup Inc., JP Morgan Chase, and Morgan Stanley — to assess the risks in financing electric power projects in terms of climate change. These principles call for "enhanced diligence" in evaluating electric power industry borrowers in terms of their use of energy efficiency; renewable and low-carbon distributed energy technologies; and conventional and advanced generating technologies. These guidelines were announced in February 2008 to address the increasing public concern over the plans to create over one hundred coal power plants in the