Ключевые слова: air quality, atmosphere, carbon dioxide, chimney, clean energy, climate change, climate policy, co2 reduction, ecological footprint, ecology, emissions, energy, environment, environmental protection, environmental science, environmentalism, europe, european union, factory, flag, fossil fuels, global warming, gray, industrial impact, industry, pollution, pollution control, power plant, regulation, renewable energy, sky, smog, smoke, sustainability,