Ключевые слова: ash, background, bituminous, black, burning, carbon, charcoal, clean, coal, coalindustry, companies, cost, cube, dark, deposit, dirty, effect, energy, environment, exploitation, export, extract, extraction, fuel, gas, heat, hot, industry, lignite, manufacturing, material, metallurgical, mine, miner, mineral, power, powerstation, prices, resources, rock, smoke, stone, stove, surface, texture, textured, tiled, types, unclean, winter,