1.from the aspect of its formation Wood pellets are 100% natural, no using adhesive, chemicals or additives, there's naturally substance called lignin in wood,which can make the wood particles compaction, uniform shape. 2.from the perspective of sustainable development Most of the wood pellets are made from wood chips or other wood industrial wastes, rather than by cutting down trees. The efficiency of the furnace burning wood pellet is much cleaner than the organic decomposition in the forest. 3.from the perspective of the impact on the environment when burning 1ton of wood pellet heating fuel: -replaces 120 gallons of heating oil -or 170 gallons of propane -or 16000 ft3 of natural gas -or 4775kwh of electricity