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