Ключевые слова: background, bituminous, black, central heating, coal, coal burning, coal mine, coal mining, coal plant, coal power plant, cube, dark, deposits, ecology, effect, energy, environment, exploitation, extract, extraction, fuel, gas, hand, hand coal, heat, hold, hold coal, hot, industry, lignite, man, manufacturing, metallurgical, mine, miner, mineral, mining, nature, person, pile, plant, power, power plant, power station, resources, stone, unclean, underground, worker,