Ключевые слова: air, artificial, ash, ashdisposal, azure, beauty, blue, bright, burning, calcium, chemicals, chemistry, coal, color, danger, dead, destruction, dirty, disaster, dump, dyes, ecology, environmental, exhaust, factory, funnel, garbage, generation, global, heavy, industrial, junk, junkyard, lake, nature, outdoors, ozone, poison, pollution, smog, summer, toxic, trash, tree, turquoise, turquoise lake, urban, vapor, warming, waves,