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<p>percent of the world's annual <a href="page.php?w=Greenhouse_gas_emissions">CO<sub>2</sub> emissions</a>.</p>

<p><big> Origins </big></p>
<p>Coal-seam fires can be divided into near-surface fires, in which seams extend to the surface and the oxygen required for their ignition comes from the atmosphere, and fires in deep underground mines, where the oxygen comes from ventilation.</p>

<p>Mine fires may begin as a result of an industrial accident, generally involving a gas explosion.  Historically, some mine fires were started when <a href="page.php?w=bootleg_mining">bootleg mining</a></p><p>
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