Ключевые слова: background, bituminous, black, burning, central, clean, coal, companies, cost, cube, dark, deposit, effect, energy, environment, exploitation, extract, extraction, fuel, gas, heat, heating, hot, industry, lignite, manufacturing, material, metallurgical, mine, miner, mineral, pictures, power, prices, resources, smoke, station, stone, stove, texture, textured, tiled, types, unclean, uses, winter,