In a reducing environment you can also use a metal powder (like aluminium or magnesium), which at high temperatures reacts with CO2 and burns, self-sustainingly.<p>More on this: <a href="http:&#x2F;&#x2F;newmars.com&#x2F;forums&#x2F;viewtopic.php?id=6157" rel="nofollow">http:&#x2F;&#x2F;newmars.com&#x2F;forums&#x2F;viewtopic.php?id=6157</a>