Wood is a renewable resource that regenerates itself continuously and the rational and sustainable use of forests can provide an unlimited amount of energy.
During its combustion it releases exactly the amount of carbon dioxide that the plant filters from the air while growing up, the same that would be created in the event that the wood was left to decompose in the woods.
Considering the same amount of heat produced the wood turns out to be significantly cheaper than natural gas and oil, also having a very low environmental impact.