A fuel may be a fuel formed by natural processes, like anaerobic decomposition of buried dead organisms, containing organic molecules originating in ancient photosynthesis that release energy in combustion. Fossil fuels are hydrocarbons, primarily coal, heating oil or gas , formed from the remains of dead plants and animals. In common dialogue, the term fuel also includes hydrocarbon-containing natural resources that aren't derived from animal or plant sources.The four sorts of fossil fuels are petroleum, coal, gas and Orimulsion (capitalized because it's a proprietary, or trade, name).In common dialogue, the term fuel also includes hydrocarbon-containing natural resources that aren't derived from animal or plant sources.

These are sometimes known instead as mineral fuels. The utilization of fossil fuels has enabled large-scale industrial development and largely supplanted water-driven mills, also because the combustion of wood or peat for warmth. Fossil fuel may be a general term for buried combustible geologic deposits of organic materials, formed from decayed plants and animals that are converted to petroleum , coal, gas , or heavy oils by exposure to heat and pressure within the crust over many many years. The burning of fossil fuels by humans is that the largest source of emissions of CO2 , which is one among the greenhouse gases that permits radiative forcing and contributes to heating .A small portion of hydrocarbon-based fuels are biofuels derived from atmospheric CO2 , and thus don't increase internet amount of CO2 within the atmosphere.A fuel may be a fuel formed by natural processes, like anaerobic decomposition of buried dead organisms, containing organic molecules originating in ancient photosynthesis[1] that release energy in combustion.[2] Such organisms and their resulting fossil fuels typically have an age of many years, and sometimes quite 650 million years