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Hydrocarbons are organic compounds consisting entirely of hydrogen and carbon atoms. They are the most abundant organic compounds on Earth, as well as the most important source of energy for human activities. Hydrocarbons are found in fossil fuels such as coal, oil, and natural gas, and are used to produce fuels, plastics, and other products. The combustion of hydrocarbons releases carbon dioxide and other pollutants into the atmosphere, contributing to global climate change.