Coal is black or brown rock and is often black in combustible and combustible, and is found in earthen layers or veins, consisting mainly of carbon, in addition to varying proportions of other elements (topped by hydrogen, sulfur, oxygen, and nitrogen in addition to other elements
Coal is a fossil fuel that has been used throughout history as a source of thermal energy. It was used for heating and as a fuel for locomotives at the beginning of the era of the invention of the steam machine. Today the primary use of this energy is for electricity. The coal-fired power plants give two-thirds of the electricity consumed in the world, and it is also one of the largest sources of abnormal carbon dioxide emissions (i.e. as a result of human practices). In 1999, the total global emission of carbon dioxide from coal was 8,666 million tons. In 2011, the total carbon dioxide emission from coal was 14,416 tons. Coal-fired generators emit about 2,000 pounds of carbon dioxide to generate every megawatt hour
Coal-fired electricity generators emit about 2,000 pounds of carbon dioxide to generate every megawatt hour, which is about twice that of natural gas to generate the same energy (estimated at 1,100 pounds). Because of the higher efficacy of natural gas in generating electricity, and the market transition in the United States of America shifted to reduce coal-fired electricity generation and increase it with gas, the carbon dioxide emission there has decreased, and readings in the first quarter of 2012 were the lowest compared to any reading in the first quarter Since 1992. In 2013, the President of the United Nations Climate Agency indicated that most of the coal stocks are kept in the ground to avoid catastrophic global warming. Also, coal is also used in the production of coke, which is an essential raw material in the iron and steel industry.
Other materials are produced from the coke production process, which can be used in the manufacture of medicines, dyes, and fertilizers
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