Are wood pellets and chips gradually replacing the fundamental fuels?

Made from waste wood and sawdust, wood pellets and chips are economic and eco-friendly fuels for lots of industry, replacing the basic ones such as fuels and water flow. After eliminating the useless elements and releasing the oxygen inside, wood pellets could generate enormous energy. For instance, 1 kg of wood pellets produces over 4,600 kcal of heat. Due to the origin, its footprint in environment is less than any previous fuels.