The first known use of fuel was the combustion of firewood by Homo erectus nearly two million years ago. Throughout most of human history only fuels derived from plants or animal fat were used by humans. See more

Nuclear fuel is any material that is consumed to derive nuclear energy. In theory, a wide variety of substances could be a nuclear fuel, as … See more

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• "Directive 1999/94/EC of the European Parliament and of the council of 13 December 1999, relating to the availability of consumer information on fuel economy and CO2 emissions in respect of the marketing of new passenger cars" (PDF). (140 KB). See more

Chemical fuels are substances that release energy by reacting with substances around them, most notably by the process of combustion.
Chemical fuels are divided in two ways. First, by their physical properties, as a solid, liquid or gas. … See more

Most transportation fuels are liquids, because vehicles usually require high energy density. This occurs naturally in liquids and solids. High energy density can also be provided by an internal combustion engine. These engines require clean-burning fuels. … See more

Works cited
• IPCC (2013). Stocker, T. F.; Qin, D.; Plattner, G.-K.; Tignor, M.; et al. (eds.). Climate Change 2013: The Physical Science Basis See more