Wood has been the primary source of fuel for man since he first harnessed fire. It is cheap and abundant, which is why it was so effective as a renewable fire source. Despite the paradigm shift towards fossil fuels the over the last two centuries, approximately two billion people world-wide still use wood as their main source of fuel. The majority of these are households in developing countries, but a number of Americans still use wood stoves as the primary source of heat in their homes. Additionally, some industrial buildings have been known to use wood, primarily scraps of wood from logging or milling to provide heat and electricity.
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