Coal is a black or brownish-black sedimentary rock formed from ancient plant material subjected to heat and pressure over millions of years. It is a vital fossil fuel used primarily for electricity generation and steel production. Coal comes in four main types: lignite, sub-bituminous, bituminous, and anthracite, each varying in carbon content and energy output. Despite being an affordable energy source, coal is a major contributor to greenhouse gas emissions, making it central to global climate change debates. As renewable energy rises, coal's role in energy production is gradually declining.

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