Ключевые слова: alternative energy, beech, biology, biomass, brown, bundle, charcoal briquette, coal, cylinder, energy, environment, exploding, fir tree, fireplace, fuel and power generation, heap, heat, high angle view, industry, kinds, log, material, oak, organic, pellet gun, pellets, pine, power, recycling, renewable energy, samaniego, sharing, sunflower, timber, variation, wood,