Firewood's any wood like material that's gathered and used for fuel. Generally, firewood isn't highly processed and's in some sort of recognizable log or branch form. Firewood's a so called renewable resource. However, demand for this fuel can outpace its ability to regenerate on local and regional level. For example in some places in the world and through history, the demand has led to desertification. Good forestry practices and improvements in devices that use firewood can improve the the lo… (More on Firewood)