Ключевые слова: air, anti, atmosphere, bubble, carbon, cloud, co2, combustion, concept, contamination, damage, dark, design, dioxide, eco, ecology, emission, emissions, emit, environment, environmental issues, exhaust, flat, gas, global, greenhouse, icon, illustration, industry, isolated, pollutant, pollute, pollution, reduce, reduction, set, smog, smoke, symbol, warming, white,