Ключевые слова: background, black, block, bunch, carbon, charcoal, closeup, coal, coalmining, collection, color, combustion, dark, day, dirty, electricity, energy, environment, exploitation, fossil, fuel, geology, heap, heat, industrial, industry, many, material, mine, mineral, object, piece, piles, pollution, power, production, raw, resource, rock, small, stack, structure, texture,