Ключевые слова: air, air pollution, blue, carbon dioxide, chemistry, chimney, coal, concepts, consumerism, copy space, digitally generated image, energy, environment, environmental damage, factory, fossil fuel, fuel and power generation, fumes, global warming, horizontal, impact, industry, information sign, information symbol, low angle view, medicine and science, message, molecular structure, nature, no people, pollution, science, sign, sky, smog, smoke, spray, steam, sunlight, symbol, technology, text,