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Fossil fuels are mainly composed of hydrogen and carbon in various forms - solid, liquid, or gas, impacting the environment through CO2 emissions.
Fossil fuels primarily consist of hydrocarbons which are compounds made up of hydrogen and carbon. These fuels can be in solid form like coal, liquid form like petroleum, or gaseous form like natural gas. The combustion of fossil fuels releases carbon dioxide into the atmosphere, contributing to greenhouse gas emissions.