The critical difference between biomass fuels and fossil fuel, is that of fossil and contemporary carbon. Burning fossil fuels results in converting stable carbon sequestered millions of years ago into atmospheric carbon dioxide (when the global environment has adapted to current levels). Burning biomass fuels however, returns to the atmosphere contemporary carbon recently taken up by the growing plant, and currently being taken up by replacement growth. If wood fuel is sourced from well managed woodlands, then carbon released from the wood during combustion will be removed from the atmosphere as the remaining trees and seedlings photosynthesize.