Ключевые слова: accord, agreement, air, atmosphere, black, building, carbon, chemical, chimney, china, climate, clouds, co2, danger, dioxide, dirty, ecology, emissions, energy, environment, environmental, exhaust, factory, fuel, fume, gas, global, greenhouse, industrial, industry, mill, ozone, paper, paris, plant, pollute, pollution, production, refinery, smog, smokestack, stack, steam, tower, toxic, urban, vapor, warming, waste, white,