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.
Carbon capture and storage dioxide per year. Phase 1 of this project was the construction of a 250 MW IGCC demonstration plant for R&D that began in 2009 and was set for completion by 2012. Phase 2, which is still in progress, involves construction of a pilot plant that produces electricity from hydrogen and captures carbon dioxide for industrial use. CHNG has also partnered with American coal company Peabody Energy on this project. Climeworks opened the first commercial direct air capture plant in Zürich, Switzerland. Their process involves capturing carbon dioxide directly from ambient air using a patented filter, isolating the captured carbon dioxide