<P> Slow combustion stoves increase efficiency of wood heaters burning logs, but also increase particulate production . Low pollution / slow combustion stoves are a current area of research . An alternative approach is to use pyrolysis to produce several useful biochemical byproducts, and clean burning charcoal, or to burn fuel extremely quickly inside a large thermal mass, such as a masonry heater . This has the effect of allowing the fuel to burn completely without producing particulates while maintaining the efficiency of the system . </P> <P> In some of the most efficient burners, the temperature of the smoke is raised to a much higher temperature where the smoke will itself burn (e.g. 609 ° C for igniting carbon monoxide gas). This may result in significant reduction of smoke hazards while also providing additional heat from the process . By using a catalytic converter, the temperature for obtaining cleaner smoke can be reduced . Some U.S. jurisdictions prohibit sale or installation of stoves that do not incorporate catalytic converters . </P> <P> Depending on population density, topography, climatic conditions and combustion equipment used, wood heating may substantially contribute to air pollution, particularly particulates . The conditions in which wood is burnt will greatly influence the content of the emission . Particulate air pollution can contribute to human health problems and increased hospital admissions for asthma & heart diseases . </P> <P> The technique of compressing wood pulp into pellets or artificial logs can reduce emissions . The combustion is cleaner, and the increased wood density and reduced water content can eliminate some of the transport bulk . The fossil energy consumed in transport is reduced and represents a small fraction of the fossil fuel consumed in producing and distributing heating oil or gas . </P>

Outline the use of wood in australian history