Ключевые слова: alternative, ardent, bio, biofuel, biological, biology, biomass, boiler, burn, central, chips, conservation, domestic, eco, ecofriendly, ecology, economy, efficiency, energy, environment, fire, flowing, fossil, fuel, generation, grain, granule, heap, heat, household, industrie, industry, mass, materials, measurement, nature, no, pellet, phenomenon, recycling, renewable, sawdust, solid, sources, straw, texture, timber, unit, waste, winter,