Ключевые слова: abstract, ash, background, bituminous, black, bonfire, burning, business, central, centralheating, coal, companies, cost, cube, dark, dirty, effect, energy, environment, exploitation, extract, extraction, fuel, heat, hot, industry, lignite, macro, manufacturing, material, metallurgical, mine, miner, mineral, nature, pieces, pile, power, prices, resources, smoke, stock, stone, stove, texture, textured, tiled, types, unclean, winter,