Ключевые слова: air pollution, atmosphere, carbon dioxide, chimney, climate change, cloudy sky, coal, conservation, contamination, dark, eco friendly, ecology, emissions, energy, environment, environmental damage, environmental issues, environmental protection, exhaust, factory, fossil fuels, gambling, global warming, green energy, greenhouse gases, industrial, industry, nature, pollution, power, power plant, problem, renewable energy, responsibility, smog, smoke, steam, sustainability, toxic, waste,